调节机构根据阀芯结构分为（）。
A、气开式和气关式
B、快开、直线性、抛物线和对数（等百分比）
C、单芯阀、双芯阀
D、直行程和角行程
参考答案：C
根据下列句子的意思及所给的汉语提示，写出空缺处单词、固定短语或固定搭配的正确形式。
根据句意及所给提示，补全单词或用单词、固定短语、固定搭配的正确形式填空。
小题1:--- Could you help me with my English? --- With p___________.
小题2:Linton is interested in Chinese history and this is his_____(第四) visit to China.
小题3:You should learn how to keep happy and eat _______(health).
小题4:The boy felt __________(困倦的) in class because he stayed up late last night.
小题5:So Terrible! The airplane ______________(起飞) five minutes ago.
摇测变压器绝缘电阻时应注意哪些问题？
