对混凝土拌合物运输的基本要求是______。
A.不产生离析现象
B.保证规定的坍落度
C.混凝土初凝之前有充分时间浇捣
D.以上A、B与C
参考答案:D
---Mike seldom has breakfast at home, _______?
--- _______ this morning.
A.does he; No, but he did
B.does he; No, he hasn’t
C.has he; Yes, he has
D.hasn’t he; Yes, he doesn’t
外周血中性粒细胞增高的疾病是:()
A.慢性肉芽肿病
B.腺苷脱氨酶缺乏
C.嘌呤核苷酸磷酸化酶缺乏
D.白细胞黏附分子缺陷病
E.X-连锁高IgM血症