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问题
单项选择题
腮腺良性肿瘤中以哪种最多见()
A．腮腺淋巴瘤
B．腮腺混合瘤
C．腮腺血管瘤
D．腮腺脂肪瘤
E．沃辛瘤
答案
参考答案：B
选择题
Only when the meeting began _____ that he had left his papers at his office.
A. will he realize
B. he did realize
C. did he realize
D. should he realize
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填空题
柴油机连杆的作用是连接活塞与曲轴，并将活塞的往复运动变为曲轴的（）。
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