题目内容

通常不通过工件,磨损极少,所以不需要留磨损储备量。在使用过程中经常通过工件,会逐渐磨损,应当留出适当的磨损储备量。

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1.How many people are there on Earth? Over ________.

A. 7,000,000,000
B. 7 billion
C. 7 million
D. 70,000,000

How many countries are there on Earth? There are______.

A. 175
B. 159
C. 195
D. 95

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B. 70,000
C. 700
D. 70

How many typical people are there on Earth?Over ________.

A. 90 billion
B. 9,00,000
C. 9 billion
D. 9,000,000