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【单选题】
圆截面杆受图示,使杆发生弯曲变形的是( )A.
力F
B.
力偶M1
C.
力偶M2
D.
力偶M1和力偶M2
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【单选题】负压筛析检测前，应把负压筛放在筛座上，盖上筛盖，接通电源，检查控制系统，调节负压到（）Pa范围内。
A.
4000～6000
B.
400~600
C.
40~60
D.
4~6
【简答题】句型拓展。 1．The new pen is six yuan .( 提问划线部分) _________ ___________ is the new pen? 2.There are four people in my family. .( 提问划线部分) _______ _________ people are there i n your family? 3.They are going t...
【单选题】Antennas in the new systems have only changed in weight, and they are becoming lighter and lighter.
A.
Y
B.
N
C.
NG
【单选题】Educationists across China are experimenting and trying out new assessing systems _______to assessing students' performance in school. [ ]
A.
suitable
B.
equal
C.
appropriate
D.
fit
【单选题】Compared with the former phone communications from aircraft, the new systems will provide clearer and more instant call service.
A.
Y
B.
N
C.
NG
【简答题】Why is it impossible to use the new technique to search for life in other solar systems now?
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