Nonverbal messages can be used to accent or emphasize distinct points in verbal messages. Which of the following are the examples of accenting

A． Saying something quicker than usual.

B．Pausing before saying something.

C． Saying something in a lower voice than usual.

D．Saying something louder than usual.

物块A置于倾角为30°的斜面上，用轻弹簧、细绳跨过定滑轮与物块B相连，弹簧轴线与斜面平行，A、B均处于静止状态，如图所示。A、B重力分别为10N和4N，不计滑轮与细绳间的摩擦，则（）

A.弹簧对A的拉力大小为6N

B.弹簧对A的拉力大小为10N

C.斜面对A的摩擦力大小为1N

D.斜面对A的摩擦力大小为6N