The cargo is now and（）found short during discharging at your port.

A.than

B.then

C.when the line pull reaches the breaking strengh of the fall

D.while

患儿，男，14岁，上下牙列釉质发育不全，此时前牙首选治疗方案是

A．烤瓷冠

B．可见光固化树脂罩面

C．前牙3/4冠

D．金-塑混合全冠

E．硬树脂冠