炉管在高温下,由于应力作用而发生的管径增长称之为金属的()。
A.蠕胀
B.蠕变
C.化学腐蚀
D.应力腐蚀
参考答案:A
轴流泵启动要求出口阀门()。
A、全关
B、全开
C、半关
D、渐开
These days the government has issued several economic policies that will________prosperity of
manufacturing industry.[ ]
A. accumulate
B. accomplish
C. access
D. accelerate