伴有冠心病的高血压不宜用()
A.普萘洛尔
B.硝普钠
C.硝苯地平
D.肼屈嗪
E.哌唑嗪
参考答案:D
Tom is ___________ that he can’t go to school.
A.so a young boy
B.a so young boy
C.a such young boy
D.such a young boy
点火提前角过大或过小对发动机有何影响?