23+45=2215(吨);
答:这堆煤有2215吨.
We all hold ________ belief that those who have ________ wonderful sense of humor are more popular.
A.a; the
B./; /
C.the; /
D.the; a
《煤矿安全规程》规定女工不得从事繁重的体力劳动、有强烈震动的作业以及矿井下作业。