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【单选题】
下列那个结构不属于放线菌A.
气生菌丝
B.
营养菌丝
C.
孢子丝
D.
假菌丝
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皮皮学刷刷变学霸
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【单选题】It usually (takes) much (less) time (to fly) from one country to another than (traveling) by train.
A.
takes
B.
less
C.
to fly
D.
traveling
【单选题】One of the disadvantages of traveling as an air courier is that he ______.
A.
cannot decide when and where to travel
B.
cannot take any luggage with him
C.
has to wear two pairs of jeans
D.
saves little money from the travel
【单选题】On a medium-speed main propulsion diesel engine, the crank-pin or crank journalbearings receive lubricating oil from( ).
A.
a spindle lubricator
B.
an oil jet
C.
internal splashing
D.
drilled passages in the crankshaft
【简答题】电动势的方向规定从电源的负极指向正极即____升高的方向。
【单选题】It usually takes much (less) time to fly from one country to (another) than (traveling) (by) train.
A.
less
B.
another
C.
traveling
D.
by
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