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【单选题】
提高蜗杆传动效率的主要措施是__。A.
增加蜗杆头数 z 1
B.
增加蜗轮齿数 z 2
C.
增大 蜗轮直径d 2
D.
增大蜗杆的直径系数 q
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举一反三
【单选题】--Where is Tom? --He Beijing.
A.
went to
B.
has been to
C.
has gone to
D.
had gone to
【单选题】“Where is Tom?” “ He isn’t here I think he _ have gone home.”
A.
may
B.
must
C.
might
D.
A or B or C
【单选题】Where is Tom? He is in the ____________.
A.
toilet
B.
bedroom
C.
living room
D.
kitchen
【单选题】— Jack, where is Tom? — He is in Mr. Smith's office now, sir. — Please tell him that I want to see her ______ she arrives. [ ]
A.
at the moment
B.
the moment
C.
in the moment
D.
For the moment
【简答题】Where is Tom? He _________ (go) to the post office.
【单选题】——Where is Tom? Is he watching TV? ——No, he isn’t. _________________.
A.
He is watching TV.
B.
He doing homework at home.
C.
He watches TV.
D.
He is helping mom in the kitchen.
【简答题】Where is Tom? He ________ here just now.
【单选题】Where is Tom? He ____ the teacher’s office, I think.
A.
has go to
B.
has gone to
C.
has been to
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