液化气罐脱水应做到:()。
A、站在下风向
B、两人同时到现场,一人作业,一人监护
C、两人同时到现场,分头脱水,互相照顾
D、只要戴好防毒面具,可一人去脱水
参考答案:B
-- Sir, could you please wait for another 20 minutes and we’ll serve you very soon.
-- Another 20 minutes? It was only 6 o’clock ________ I got here, but it’s 7∶10 now.
A.since
B.when
C.that
D.before
流量计检定中所说的标准流量是指()
A.流量计的指示值
B.根据脉冲数和测量时间计算的流量
C.由基准器测得的流量
D.输水时流量计的批示值