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【单选题】
The river ____are covered with trees is very longA.
which banks
B.
of which banks
C.
whose the banks
D.
the banks of which
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举一反三
【单选题】Which of the following property of language enables language users to overcome the barriers caused by time and place?
A.
Transferability.
B.
Duality.
C.
Displacement.
D.
Arbitrariness.
【简答题】Evidence of the extent of the language barrier can be gained from ______ of materials used by scientists such as books and periodicals.
【单选题】The barrier of language keeps many scientists in prolonged ignorance of work of immediate importance to them ______at present in many countries.
A.
doing
B.
to be done
C.
having done
D.
being done
【单选题】下列说法最正确的是（）
A.
尺寸偏差是代数差，可以是正的，也可以是负的，甚至为零。
B.
尺寸公差是代数差，可以是正的，也可以是负的，但不能为零。
C.
所谓尺寸偏差，就是实际尺寸与理论尺寸的误差。
D.
所谓尺寸公差，就是实际尺寸与理论尺寸的误差。
【简答题】该信用证是哪种类型的信用证?
【简答题】极限偏差是 尺寸减 尺寸所得的代数差,可以为 值、 值或 ;而公差则是 ,数值前不能有正负号,且其值不能为 。
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