取压点到压力计之间应装有()
A、排污阀
B、切断阀
C、放空阀
D、调节阀
参考答案:B
While people may refer to television for up-to-the-minute news, it is unlikely that television _____ the newspaper completely.
A.replaced
B.have replaced
C.replace
D.will replace
昆虫完全变态是指个体发育过程经历卵、______、______和成虫的发育时期.