Growing economic problems were highlighted by a slowdown in oil output.

A．accounted for

B．worked out

C．made prominent

D．taken for granted

标准流量计的误差应只有被检流量计误差的（），并应定期用更高一级精度的标准器对标准流量进行校对。

A、1/5

B、1/4

C、1/3

D、1/2