有30名同学，平均站在三角形阵的三条边上，每边最多能站[ ]
A．10人
B．11人
C．12人
答案：B
配氢线一定要经过（）后方可引入氢气，防止爆炸。
The shop-assistant was straight with his customers. If an article was of _____ quality, he'd tell them so.
A．humble
B．minor
C．inferior
D．awkward
