压力表选择要求是保证测量精确度,被测压力不得低于所选压力量程上限的()。
A.1/4;
B.1/3;
C.1/2;
D.1/5。
参考答案:B
With the world changing fast, we have something new ______with all by ourselves every day.
A.deal
B.dealt
C.to deal
D.dealing