下面哪种情况禁用β受体阻断药() ["心绞痛","快速性心律失常","高血压","房室传导阻滞","甲状腺功能亢进"]
最凶险的疟疾是() ["间日疟","脑型疟","卵形疟","三日疟","肾型疟"]
金属烤瓷全冠舌侧颈缘如以金属为冠边缘者,可预备成以下形状,除了() ["羽状","凹槽状","较宽的肩台","直角斜面形","与金属全冠边缘相同"]
压力表、可燃气体检测报警器属于安全设施中的()。
下列哪条不是胃肠型疟疾的临床表现特点() ["腹部压痛明显","经抗疟药治疗后腹痛迅速消失","腹泻","呕吐","下腹部弥漫性疼痛"]
钢包炉电加热系统的二次侧输出电压为220V,电流为30KA,功率因数为0.9。计算该系统的有功功率是多少?