要求快硬早强的混凝土,宜优先选用()。
A.硅酸盐水泥
B.普通水泥
C.矿渣水泥
D.复合水泥
参考答案:A
用所给单词的适当形式填空。
1. He _____ (not like) game shows. He thinks they are awful.
2. We're _____ (talk) to Mary now.
3. Thanks for _____ (help) me with my homework.
4. Do you _____ (love) to play football?
5. I can't stand _____ (watch) soap operas.
、针入度的试验步骤中:①将预先除去水分的沥青试样加热,加热时间不得超过20分钟,用筛孔0.6mm的筛过滤杂质。②开动秒表,在指针正指5s的瞬间,用手紧压按钮,使标准针自动落下贯入试样,经规定时间,停压按钮使针停止移动。③拉下刻度盘拉杆与针连杆顶端接触,此时刻度盘指针所指的读数(精确到0.2),即为试样的针入度。④测试针入度大于100的沥青试样时,至少用3根针,每次测定后将针留在试样中,直到三次测定完成后,才能把针取出。上述描述中正确的是()
A、①;
B、②;
C、③;
D、④;