It was unbelievable that the fans waited outside the gym for three hours just ____ a look at the sports starts.
A. had
B. having
C. to have
D. have
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--I didn't hear you come in last night.-- That's good. We tried ___ noisy.
A. not to
B. to be not
C. to be
D. not to be
--I hear that you and Francis will spend your vacation in Nepal next spring.-- Yes, we are planning _____.
A. to
B. to be
C. it
D. to do it
患者因左下后牙龋坏就诊,一次银汞充填完成治疗,治疗后咬物疼痛。检查:36 DO 充填体完好,边缘密合,表面有亮点,叩痛(-),牙龈正常,牙髓温度测试无异常。该牙应如何处置( )
A. 磨除高点
B. 脱敏治疗
C. 开髓治疗
D. 去除原充填体
E. 去除原充填体,氧化锌丁香油粘固剂安抚
银汞合金在调制及使用过程中,不释放汞蒸气污染环境的是( )
A. 调制前汞散落
B. 硬固后的银汞合金碎屑
C. 调制过程未在密闭容器中进行
D. 排入下水道的散落的银汞合金碎屑
E. 放入盛有高饱和盐溶液的银汞收集器中的银汞合金碎屑