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【单选题】
以下关于if语句说法不正确的是?
A.
if语句中“表达式”一般为逻辑表达式或关系表达式，也可能是1位的变量。系统会对表达式的值进行判断，若为0，则按‘假’处理；若为1，则按‘真’处理，执行指定语句；若为x，z，则按其他情况处理。
B.
if语句可以多重嵌套，对于if语句的嵌套，若不清楚if和else的匹配，最好用begin-end语句括起来。
C.
if语句必须在过程语句中使用；
D.
else语句不能做单独语句使用，必须与if配对。
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举一反三
【单选题】China adopted the practice of( )in customs clearance following the establishment of a new clearance system for goods subject to inspection and quarantine on 1 January lst 2000.
A.
customs declaration before quarantine inspection
B.
customs declaration and quarantine inspection at the same time
C.
quarantine inspection before customs declaration
D.
none of them
查看完整题目与答案
【简答题】选做题：如下图，已知直线l 1 ∥l 2 ，直线l 3 和直线l 1 、l 2 交于点C和D，在C、D之间有一点P，如果P点在C、D之间运动时，问∠PAC，∠APB，∠PBD之间的关系是否发生变化。若点P在C、D两点的外侧运动时（P点与点C、D不重合），试探索∠PAC，∠APB，∠PBD之间的关系又是如何？
查看完整题目与答案
【单选题】China adopted the practice of ( ) in customs clearance following the establishment of a new clearance system for goods subject to inspection and quarantine on January 1st 2000.
A.
customs declaration before quarantine inspection
B.
customs declaration and quarantine inspection at the same time
C.
quarantine inspection before customs declaration
D.
none of them
查看完整题目与答案
【单选题】(4) China adopted the practice of ( ) in customs clearance following the establishment of a new clearance system for goods subject to inspection and quarantine on January 1st 2000.
A.
customs declaration before quarantine inspection
B.
customs declaration and quarantine inspection at the same time
C.
quarantine inspection before customs declaration
D.
none of them
查看完整题目与答案
【单选题】China adopted the practice of ( ) in customs clearance following the establishment of a new clearance system for goods subject to inspection and quarantine om January 1st 2000.
A.
customs declaration before quarantine inspection
B.
customs declaration and quarantine inspection at the same time
C.
quarantine inspection before customs declaration
D.
none of them
查看完整题目与答案
【单选题】常见的吸附等温线不包括:
A.
单分子层吸附等温线
B.
多分子层吸附等温线
C.
双分子层吸附等温线
D.
指数型吸附等温线
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【单选题】设光敏电阻GM20539在10lx的光照下的阻值为50K，且已知它在10~100lx范围内的【图片】。试求该光敏电阻在90lx光照下的阻值（）
A.
8621.4
B.
862.14
C.
86.214
D.
8.6214
查看完整题目与答案
【判断题】人造奶油比动物奶油更健康
A.
正确
B.
错误
查看完整题目与答案
【单选题】在制作拿铁拉花时,郁金香图形可采用( )奶缸。
A.
尖口
B.
宽口
C.
方口
D.
圆口
查看完整题目与答案
【单选题】China adopted the practice of ( ) in customs clearance following the establishment of a new clearance system for goods subject to inspection and quarantine on January 1st 2000.
A.
quarantine inspection and customs declaration at the same time
B.
quarantine inspection
C.
quarantine inspection before customs declaration
D.
customs declaration before quarantine inspection
查看完整题目与答案
相关题目：
【单选题】China adopted the practice of( )in customs clearance following the establishment of a new clearance system for goods subject to inspection and quarantine on 1 January lst 2000.
A.
customs declaration before quarantine inspection
B.
customs declaration and quarantine inspection at the same time
C.
quarantine inspection before customs declaration
D.
none of them
查看完整题目与答案
【简答题】选做题：如下图，已知直线l 1 ∥l 2 ，直线l 3 和直线l 1 、l 2 交于点C和D，在C、D之间有一点P，如果P点在C、D之间运动时，问∠PAC，∠APB，∠PBD之间的关系是否发生变化。若点P在C、D两点的外侧运动时（P点与点C、D不重合），试探索∠PAC，∠APB，∠PBD之间的关系又是如何？
查看完整题目与答案
【单选题】China adopted the practice of ( ) in customs clearance following the establishment of a new clearance system for goods subject to inspection and quarantine on January 1st 2000.
A.
customs declaration before quarantine inspection
B.
customs declaration and quarantine inspection at the same time
C.
quarantine inspection before customs declaration
D.
none of them
查看完整题目与答案
【单选题】(4) China adopted the practice of ( ) in customs clearance following the establishment of a new clearance system for goods subject to inspection and quarantine on January 1st 2000.
A.
customs declaration before quarantine inspection
B.
customs declaration and quarantine inspection at the same time
C.
quarantine inspection before customs declaration
D.
none of them
查看完整题目与答案
【单选题】China adopted the practice of ( ) in customs clearance following the establishment of a new clearance system for goods subject to inspection and quarantine om January 1st 2000.
A.
customs declaration before quarantine inspection
B.
customs declaration and quarantine inspection at the same time
C.
quarantine inspection before customs declaration
D.
none of them
查看完整题目与答案
【单选题】常见的吸附等温线不包括:
A.
单分子层吸附等温线
B.
多分子层吸附等温线
C.
双分子层吸附等温线
D.
指数型吸附等温线
查看完整题目与答案
【单选题】设光敏电阻GM20539在10lx的光照下的阻值为50K，且已知它在10~100lx范围内的【图片】。试求该光敏电阻在90lx光照下的阻值（）
A.
8621.4
B.
862.14
C.
86.214
D.
8.6214
查看完整题目与答案
【判断题】人造奶油比动物奶油更健康
A.
正确
B.
错误
查看完整题目与答案
【单选题】在制作拿铁拉花时,郁金香图形可采用( )奶缸。
A.
尖口
B.
宽口
C.
方口
D.
圆口
查看完整题目与答案
【单选题】China adopted the practice of ( ) in customs clearance following the establishment of a new clearance system for goods subject to inspection and quarantine on January 1st 2000.
A.
quarantine inspection and customs declaration at the same time
B.
quarantine inspection
C.
quarantine inspection before customs declaration
D.
customs declaration before quarantine inspection
查看完整题目与答案