选择泵的安装位置不用考虑()。
A.季节温度
B.操作规程
C.管线状况
D.海拔高度
参考答案:B
电化学探头法测定水中溶解氧时,若水样中含有铁及能与碘作用的物质,会对膜电极法的测量产生干扰。
As countries ______ to increase yields on existing croplands through intensified use of water, energy, and fertilizers, the cost of commodities will rise.
A.encounter B.enchant C.enlarge D.endeavor