()不是计数器当前值加1的条件。
A、复位电路断开
B、计数输入电路断开
C、当前值小于设定值
D、计数输入电路由断开变为接通
参考答案:B
-- What a pity! You missed the beginning of the movie, it __ for 10 minutes.
-- Oh, a traffic jam!
A.began
B.stated
C.has been on
D.has been off
最不适于超声波检查的器官是()
A.肺段
B. * *
C.前列腺
D.甲状腺
E.肝