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【单选题】
相对计程仪航程是船舶在 情况下的对水航程。I.无风流;II.有风无流;III.有流无风;IV.有风流。A.
Ⅰ~Ⅳ
B.
Ⅰ,Ⅱ
C.
Ⅰ,Ⅱ,Ⅳ
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皮皮学刷刷变学霸
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【简答题】引下线宜采用________或________,宜优先采用________。
【简答题】引下线宜采用圆钢或扁钢，宜优先采用圆钢。圆钢直径不应小于（）。扁钢截面不应小于（），其厚度不应小于（）。
【简答题】What do American students try to do in class? They try to ______ in working out problems by themselves.
【单选题】—I'd like to do somle volunteer work, but I'm not sure what I should do. —You ______ give out food at the food bank. [ ]
A.
should
B.
must
C.
could
D.
need
【简答题】How do the Wertmans work out their problems?
【简答题】引下线宜采用（）或（），宜优先采用（）。
【简答题】引下线宜采用圆钢或扁钢，宜优先采用（）。
【单选题】--Do you hear a fire ___ last night?---Yes, it __ by the firemen in no time.
A.
broke out, was put out
B.
was broken out, was put out
C.
went out ; was put out
D.
broke out; gone out
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