下列说法中正确的是（ ） A．根据公式ρ=m/V可以说，物质密度与物体的质量成正

《压力容器安全监察规程》规定压力容器的钢印标记是识别压力容器的依据。钢印标记必须准确、清晰、完整，以永久标记的形式打印在瓶肩或不可卸附件上。

According to the Professional Conduct Standards relating to loyalty, prudence and care, an accurate list of requirements to members and candidates with respect to a member's duties to clients would NOT include:（）

A. acting with reasonable care and excise prudent judgment.

B. complying with the Global Investment Performance Standards ().

C. acting for the benefit of their clients.

沉管灌注桩常见的质量事故是（）

A.缩颈桩

B.护筒冒水

C.钻孔偏斜

D.桩顶碎裂

E.吊脚桩

患者，女，20岁。医师对其右下肢做肌力检查，先将患者置于左侧卧位，下肢伸直，嘱其外展右下肢。患者不能完成此动作是由于损伤（）

A.髂腰肌

B.臀大肌

C.股四头肌

D.缝匠肌

E.臀中肌

炉前常用的主要工具有哪些？