2015年下半年天津材料员实务试题本卷共分为1大题50小题,作答时间为180分钟,总分100分,60分及格
一、单项选择题(共25题,每题2分,每题的备选项中,只有1个事最符合题意)1、由轻骨料配制成的__,一般具有良好的吸声性能,故也可作吸音砂浆用
A.耐酸砂浆B.防水砂浆C.保温砂浆D.耐碱砂浆2、烧结多孔砖的孔洞率大于等于__
A.15%B.20%C.25%D.30%3、混凝土强度标准差宜根据同类混凝土统计资料计算确定,计算时,当混凝土强度等级为C20和C25级,其强度标准差计算值小于2
5MPa时,计算配制强度用的标准差应取不小于__
5MPaB.3
0MPaC.3
5MPaD.4
0MPa4、Thecellphone,adevicewehavelivedwithformorethanadecade,offersagoodexampleofapopulartechnology’sunforeseensideeffects
Morethanonebillionare(1)aroundtheworld,andwhenasked,their(2)saytheylovetheirphonesforthesafetyandconvenience(3)provide
Peoplealsoreportthattheyare(4)intheiruseoftheirphones
Oneopinionsurvey(5)that"98percentofAmericanssaytheymoveawayfrom(6)whentalkingonawirelessphoneinpublic"(7)"86percentsaythey’never’or’rarely’speak(8)wirelessphones"whenconduc