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【单选题】
维生素C用碘量法测定含量时加入一定量的稀醋酸控制酸性其原因是( )。A.
加快反应速度
B.
使终点明显
C.
使维生素C受空气中氧的氧化速度减慢
D.
可以排除抗氧剂的干扰
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【简答题】如何控制步进电动机输出的角位移或线位移量?步进电动机有哪些优点?
【单选题】When driving from California to New Orleans, the author came across a young man, who he thought probably wanted to use a gas can to flag down a car.
A.
True
B.
False
【简答题】________寄存器的作用是用来保存程序运行过程中的各种状态信息。
【单选题】寄存器( )的作用是用来保存程序运行过程中的各种状态信息。
A.
数据指针寄存器DPTR
B.
中断优先级控制寄存器IP
C.
程序状态字寄存器PSW
D.
程序计数器PC
【单选题】When driving from California to New Orleans, the author came across a young man, who probably wanted to use a gas can to flag down a car.
A.
True
B.
False
【单选题】使用一次性注射器时护士首先应检查
A.
注射器是否在有效期
B.
注射器和针头衔接是否紧密
C.
注射器的针头、型号是否合适
D.
注射器针头是否有弯钩
E.
注射器的名称、外包装是否完好
【单选题】The author would agree that ______.
A.
many problems in China came from internal disorders due to Western influence
B.
many problems in China came from China itself and were unrelated to the West
C.
scapegoats perform. a necessary function and there should be more of them
D.
all of the above are true
【单选题】According to paragraph 2, in stating that 'he came down from the mountain' the author means
A.
the Ice Man walked down from the mountain.
B.
the Ice Man woke up in the mountain.
C.
the Ice Man's body was brought down from the mountain.
D.
the Ice man was dead while walking down the mountain.
【简答题】()寄存器的作用是用来保存程序运行过程中的各种状态信息。若累加器A中的数据为01110010B,则PSW中的P=( )。
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