用于连接强度要求较高的装配如：管件连接螺纹，应选用（）
A.60°标准螺纹
B.梯形螺纹
C.锯齿形螺纹
D.圆弧形螺纹
参考答案：B
—What kind of TV shows do you like?
—I like sitcom talk show and ______.[ ]
A. game show
B. soap
C. situation
D. Sports
简述调整麦芽醪pH的意义？
