张医师为胃大部手术患者实施手术时下列不推荐的是()
A. 进行外科手消毒
B. 戴一次性圆帽
C. 戴无菌手套
D. 戴耳挂式医用口罩
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混凝土的抗压强度是反映了混凝土中水泥与粗细骨料的粘结力的大小。
A. 正确
B. 错误
宪法在一个国家的法的体系中具有根本法的地位,表现在宪法具有的一下哪些特征()
A. 在内容上宪法规定了一个国家最根本性的制度
B. 宪法修改程序更为严格
C. 宪法具有最高法律效力
D. 宪法与一般法律的结构不同
保证气动锚杆钻机的作业安全与最优运行,操作者使用前必须检查风源和水源,保证风压在()以上,水压在0.6~1.2MPa。
A. 0.45MPa
B. 0.5MPa
C. 0.55MPa
D. 0.6MPa
A sailing vessel is overtaking a power-driven vessel in a narrow channel,so as to pass on the power-driven vessel’s port side. The overtaken vessel will have to move to facilitate passage. The sailing vessel is the().
A. stand-on vessel and would sound two short blasts
B. give-way vessel and would sound no whistle signal
C. stand-on vessel and would sound no whistle signal
D. give-way vessel and would sound two prolonged blasts followed by two short blast