起动器大多由通用的接触器、()、按钮等元件按一定方式组合而成。
参考答案:热继电器
_____ many times, he finally understood it. [ ]
A. Told
B. Telling
C. Having taken
D. Having been told
下列药物中不属于抑酸药的是()
A.雷尼替丁
B.阿托品
C.丙谷胺
D.奥美拉唑
E.碳酸氢钠