屋面防水等级为Ⅲ级，设防道数为一道设防，当采用合成高分子防水卷材时，其厚度不应小于（）mm。
A. 0.5
B. 0.8
C. 1.0
D. 1.2
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患者纳少，腹胀脘痛隐隐，喜温喜按，大便稀溏，口淡不渴，舌淡胖，苔白润，脉沉迟无力，宜诊为()
A. 脾气虚证
B. 胃气虚证
C. 胃阳虚证
D. 脾阳虚证
E. 脾虚气陷证
Pitting in the area close to the pitch line and on the same end of each gear tooth of a reduction gear unit would be caused by （）
A. corrosion on the gears
B. excessive gear speed
C. dirt in the oil
D. misalignment of the gear
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