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问题
单项选择题 A1/A2型题
进肺门后分出的支气管称（）
A.主气管
B.主支气管
C.叶支气管
D.段支气管
E.亚段支气管
答案
参考答案：
C
选择题
—What ________ he say to you just now?
—He told me that he ________ his key in the room.
A. did; leave
B. does; left
C. did; had left
D. do; had left
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判断题
数字签名并非用“手写签名”类型的图形标志，它采用了双重加密的方法来实现防伪造、防抵赖。
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