限速器动作时，限速器张力不应小于安全钳装置起作用的所需力的两倍，且允许最小值为（）N。
A、100；
B、200；
C、300；
D、400
参考答案：C
属三羧酸循环中的酶是（）。
A.NADH脱氢酶
B.丙酮酸脱氢酶
C.苹果酸脱氢酶
D.葡萄糖－6－磷酸酶
E.葡萄糖－6－磷酸脱氢酶
Which of the following is NOT a source of adverse effects of inflation on an economy Inflation: （）
A. distorts the information delivered by prices.
B. affects product prices without changing underlying resource prices, such as wages, in the long run.
C. increases the uncertainty accompanying investment and other activities involving future payments.
