混凝土重力坝内应变计组与上、下游坝面应有一定距离,此距离不宜小于()。
A、0.5~0.8m;
B、0.8~1.2m;
C、1.5~2m;
D、2.5~3m。
参考答案:C
Onethird of the area__________covered with green trees.About seventy percent of the trees
__________been planted.
A.are; have
B.is; has
C.is; have
D.are; has
某装置日原油加工量是9675吨,燃料油用量8吨,价格650元/吨,循环水14260吨,价格0.2元/吨,新鲜水9090吨,价格1.0元/吨,除盐水1120吨,价格3.2元/吨,电费17075元,其他费用15000元,求单位加工费。