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【单选题】
广角镜头的( )比标准镜头大。A.
口径
B.
像距
C.
视角
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反馈参考答案：
举一反三
【简答题】把 内通过某一导体横截面的电荷量定义为电流强度(简称电流),用 I 来表示。
【简答题】从银行提取现金，登记现金日记账的依据是（ ）。
【单选题】It wasn’t long ___ the rain stopped and the moon came out again.
A.
when
B.
until
C.
before
D.
since
【单选题】A plane can't fly to the moon because ______.
A.
the moon is 240 kilometer far away
B.
we don't know where it is
C.
it can't fly without air
D.
there is no air on the moon
【单选题】After abandoning a vessel，water that is consumed within the first 24 hours will ______.
A.
pass through the body with little absorbed by the system
B.
help to prevent fatigue
C.
quench thirst for only 2 hours
D.
help to prevent seasickness
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