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【判断题】
对调直流电动机励磁绕组接入电源的两个接线端,只能改变励磁电压的极性,不能改变直流电动机转向。A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】_____ is the power of the Internet that you can get whatever you want in no time.
A.
So
B.
This
C.
That
D.
Such
【单选题】焊接热裂纹可分为( )三类。
A.
低塑性脆化裂纹、液化裂纹和多边化裂纹
B.
结晶裂纹、液化裂纹和多边化裂纹
C.
结晶裂纹、液化裂纹和延迟裂纹
D.
结晶裂纹、液化裂纹和淬硬脆化裂纹
【单选题】If you want ______, you should not speak so quickly.
A.
to be understood
B.
to understand it
C.
understanding
D.
to understand
【简答题】There are (A) moments in life where(B) you miss someone so much that (C) you just want to (D) pick them up from dreams and hug them for real.
【简答题】焊接裂纹按照产生的条件分类,可分为焊接热裂纹、焊接冷裂纹、____、____和应力腐蚀开裂等几类。
【单选题】If you really want yourself to be in good health, you must always ______ so much.
A.
not... be smoking
B.
not... have smoked
C.
not... to smoke
D.
be not... smoking
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