阴极保护电源是阴极保护的重要设施，低电压、（）是其特点。
A.小电流
B.高电阻
C.大电流
D.低电阻
参考答案：C
When we practice_______ English, we shouldn’t end up _______in Chinese.
A．speaking, to speak
B．to speak, speaking
C．speaking, speaking
D．to speak, to speak
如果标准体积管容积允差为0.02%，则漏失量不应超过的（）.
A.0.001%
B.0.005%
C.0.002%
D.0.004%
