【单选题】We will make every ______ to ship the goods as early as possible, and we feel ______ that the shipment will be satisfactory to you in every respect.
【简答题】气瓶的减压阀应选用( )。A. 一般应选用双级压力减压阀; B. 无腐蚀性的纯气及标准混合气体可采用黄铜或黄铜镀铬材质的减压阀; C. 腐蚀性气体应选用不锈钢材质的减压阀,如H 2 S、SO 2 、NO X 、NH 3 等; D. 可燃气体减压阀的螺纹应选正扣(左旋)的,非可燃气体减压阀的螺纹应选反扣(右旋)的。