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【多选题】
影响加工余量的因素有( )。A.
上工序的表面质量
B.
前工序的工序尺寸公差
C.
前工序的位置误差
D.
本工序工件的安装误差
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举一反三
【简答题】体内氨的主要来源是 （ ）。
【单选题】Which of the following is NOT true according to the passage?
A.
The EEC spends one billion pounds on imported energy each year.
B.
At the present level of research spending it is difficult to make any significant progress in the provision of energy from the Sun.
C.
The desired breakthrough could be obtained by the end of the next decade if investment were increased.
D.
The total yearly spending of the EEC on solar energy research amounted to almost 6 million