一般情况下，螺纹连接按（）旋合长度考虑，对螺纹标记中的螺纹旋合长度代号（），必要时加注代号或直接注明旋合长度的数值。
参考答案：中等；不加标注
I shall never forget the day ________ Shen Zhou V was launched, ________ has a great effect on my life.
A．when, which
B．that, which
C．which, that
D．when, that
肾主纳气的主要生理作用是（）。
A.使肺之呼吸保持一定的深度
B.有助于元气的固摄
C.有助于精液的固摄
D.有助于元气的生成
E.有助于肺气的宣发
