无线通信设备使用.维护单位要树立全程全网观念，不得随意变动（）.使用频率.（）.天线

牙髓切断术中上颌磨牙在确定髓腔入口部位时应该制备窝洞的形状是（）。

A.颊舌径长，颊侧近、远中径短的圆三角形

B.颊舌径短，颊侧近、远中径长的圆四边形

C.颊舌径与颊侧近、远中径等长的四边形

D.颊舌径长，颊侧近、远中径短的圆四边形

E.颊舌径与颊侧近、远中径等长的三角形

防止食品腐败的依据主要是（　　）

A．把食品内的细菌都杀死

B．抑制食品内真菌的生长

C．把食品内的真菌都杀死

D．杀死或抑制微生物的生长繁殖

阅读下列各小题，根据括号内的汉语提示，用句末括号内的英语单词完成句子

71.You may                   (指望) he will come to help you.(rely)

72.He was busy writing a letter            (而不是)doing his homework.(rather)

73.—He was late again this morning.

—He                               (本应该出发) earlier. (set)

74.Can’t you see that your design            (正在被讨论)? Have some patience, please.(discuss)

75.E-mail, as well as letters,                (正起着重要的作用) in daily communication. (play)

76.I would rather you                       (求助于他) yesterday, than now. (turn)

77. He gave the long speech without                    (看他的笔记).(refer)

78.                (无论哪一本词典)you want to buy, I’ll pay for it. (whichever)

79. The school                   (缺少) for experienced teachers now. (badly)

80. Justin kicked the ball into his own goal.                   (由于) his stupidity that we won the game. (thanks)

三相对称电路的功率如何计算

内源性肝性脑病的主要原因是（）。

A.急性轻型肝炎

B.门脉性肝硬化

C.晚期血吸虫病

D.急性重型肝炎

E.慢性胆囊炎