I'm in Greece at the moment. I like the weather()
A. here
B. there
C. that
D. thi
下列细胞器中,哪一种没有膜包被着?()
A. 线粒体
B. 质体
C. 高尔基体
D. 核仁
E. 溶酶体
回转式空气预热器故障停止运行,应紧急停炉。
A. 正确
B. 错误
In vessel construction,beams are transverse girders which provide support to().
A. bulkheads
B. deckhouse structures
C. decks
D. vertical frame