受热面管子磨损量大于壁厚的20%时，应予以更换（）_爱下问搜题

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问题判断题

受热面管子磨损量大于壁厚的20%时，应予以更换（）

答案

参考答案：错

单项选择题

心室肌细胞动作电位4期内Ca2+逆浓度梯度外运是由何提供能量的

A．Ca2+泵

B．Na+－K+泵

C．Na+－Ca2+泵

D．C1-泵

E．H+泵

选择题

The teacher asked a very difficult question. It was Ted who finally _____ a good answer.

A．came up with

B．had raised

C．went through with

D．put up with