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【单选题】
（）传动是通过摩擦力来传递动力的，传递过载时，会发生打滑，可以防止其他零件的损坏，起到安全保护作用。A.
链
B.
齿轮
C.
皮带传动
D.
蜗轮蜗杆
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【简答题】Please put Mary ' s things back where you found them ______ she won ' t know where they are. [A] and [ B] or [C] but [D] then
【单选题】Lorne’s mother tried to put her son’s case on a television program named_____.
A.
Missing Persons
B.
Reunion
C.
Unsolved Mysteries
D.
Search and Rescue
【单选题】A television program_____Golden 100 seconds invites people to challenge what they really want to do.
A.
being called
B.
having been called
C.
calling
D.
called
【单选题】Can you tell me____ last year ?
A.
where does Mary work
B.
where did Mary work
C.
where Mary works
D.
where Mary worked
【简答题】核算坏账损失的方法通常有两种,即( )和( )。
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