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【判断题】
（ ）5.电和磁是不可分割的,有电流流动的地方其周围必伴随着磁场的存在。A.
正确
B.
错误
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参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】下列关于镗模底座的论述,( )是错误的。
A.
镗模底座是夹具的主要支承元件之一，应有足够的强度和刚度。
B.
镗模底座上安装定位元件和镗模支架等元件的平面应铸出相应的凸台面。
C.
为保证镗模底座的强度与刚度，底座的高度值越大越好。
D.
镗模底座与镗模支架应分开制造。
【单选题】A sail hook is used for（）.
A.
hoisting a windsail
B.
parceling
C.
sewing canvas
D.
testing canvas
【单选题】A sail hook is used for（）.
A.
hoisting a windsail
B.
parcelling
C.
sewing canvas
D.
testing canvas
【单选题】This document is ______ unless it is offcially stamped.
A.
acute
B.
confidential
C.
invalid
D.
deliberate
【单选题】I was about to sail away ______ I heard the sound of stamping and singing on the bank,
A.
when
B.
while
C.
as
D.
the instant
【简答题】This document is the property of Roll-Royce limited and may not be copied or used for any purpose other than that for which it is supplied without the express written authority of Roll-Royce limited.
【单选题】This document is ______ unless it is officially stamped.
A.
acute
B.
confidential
C.
invalid
D.
deliberate
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