三层结构聚乙烯防腐层胶粘剂必须在()时涂敷。
A.环氧粉末固化后
B.环氧粉末胶化前
C.环氧粉末胶化中
D.环氧粉末涂敷
参考答案:C
某男性,骨盆骨折后,下腹胀痛,排尿困难。查体:下腹膨隆、压痛明显、叩诊浊音,此时应考虑的损伤是()
A.肠破裂
B.后 * * 损伤
C.膀胱破裂
D.前 * * 损伤
E.输尿管损伤
_____ is known to everybody, the moon travels round the earth once every month. [ ]
A. It
B. As
C. That
D. What