第7题: [单项选择]_______, he always tries his best to complete it on time. A. However the task is hard B. However hard the task is C. Though hard the task is D. Though hard is the task 参考答案:B 答案解析:本题译文:不管这任务多难,他总是尽自己最大的努力按时完成。however,whatever,whenever,wherever,whoever,whichever可以引导让步状语从句,相当于no ma
第8题: [单项选择]用离心法测定原油含水率,首先应()。 A. 除去游离水 B. 加无水化验汽油 C. 加1~2滴破乳剂 D. 预热30min 参考答案:A