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问题 选择题

4. It used to ______ that humans and animals were different and had little in common.

A．believing

B．be believed

C．believe

D．Believed

答案

 B

问答题

(c) Explain the application of the ‘two thirds rule’ in relation to a composite supply of goods and services, indicating how a trader may seek to minimise its effects. (5 marks)
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单项选择题

使用千分尺测量时，先转动微分筒，当测量面接近工件时，改用（），指导棘轮发出吱吱声音为止。

A、棘轮

B、手柄

C、螺钉
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