TXB2减少见于（）。
A.血栓前状态
B.糖尿病
C.心肌梗死
D.脑血栓形成
E.服用阿司匹林类药物
参考答案：E
You can't imagine the difficulty he ________onto the cliff and saving the boy in trouble.[ ]
A. had to climb
B. had climbed
C. had climbing
D. had on climbing
钢材中含量在2%以内时，可明显提高强度，但对塑性和韧性影响不大的元素为 ( )
A．磷 B．硅C．碳 D．氮
