未置入高级气道的成人患者,不论单人与双人心肺复苏,按压与通气之比均为:
A. 5:1
B. 15:2
C. 30:2
D. 15:1
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对于贸易战,中国不愿打,但也不怕打,必要时则不得不打,这个态度一直没变。( )
A. 对
B. 错
脂肪酸合成的部位
A. 胞液
B. 线粒体
C. 高尔基体
D. 胞核
I wouldn't dream ______ marrying someone I hadn't lived with.
A. off
B. up
C. of
D. from
Will you apply _____ the job by letter or in person?
A. for
B. of
C. down
D. to