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【单选题】
我国第一部在国际上的获奖影片《曲》的同名主题歌是由 作曲的。A.
B.
C.
D.
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反馈参考答案：
举一反三
【单选题】A frame with two，or sometimes four，arms through which are threaded the guidelines and which is used to keep the drill stem and bit in line with the center opening in the temporary guide base is the（）.
A.
drill stem guide
B.
guide frame
C.
drill string frame
D.
casing guide
【简答题】drill string ( )
【简答题】Choose the correct word. ► Stick it together with glue/cotton . glue 1 Sew it with a pin/needle . ____ 2 Cut it with scissors/a drill . ____ 3 Tighten it with a hammer/screwdriver . ____...
【单选题】A set of clamps that are latched onto the drill pipe to allow the driller to raise or lower the drill string out of or into the hole are the（）.
A.
lifts
B.
collars
C.
elevators
D.
clamps
【单选题】图示电路中, A,频率f可变。当 的有效值等于 A时,频率f应为 A. Hz B. Hz C. Hz D. HZ 答 ( )
A.
Hz
B.
Hz
C.
Hz
D.
HZ答()
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