使用闪光灯指数为24,摄距3米,用ISO400度胶卷应选用的f系数是()
A.8
B.11
C.16
D.4
参考答案:C
用所给单词的适当形式填空。
①I have many____(friend) here.
②My brother____(have)a basketball.
③_____ Tom _____ (have) an English book?
④Let's _____ (play) ping-pong ball.
⑤Please bring the math book to____(I).
鼻疖的基本病因病机是(),代表方剂是()