每天利用核磁共振分析样品前,进行一次标样调试。调试前,仪器预热应不小于()。
A.0.5h
B.1h
C.1.5h
D.3h
参考答案:D
_______, people injured in the earthquake are _______.
A.Generally; picking up
B.Sadly; picking up
C.Luckily; setting up
D.Fortunately; picking up
一侧的脸部肌肉出现瘫痪或失去语言表达能力的,多见于()。
A.失压病
B.胃出血
C.中风
D.心脏病