下列哪项不是乳前牙反的病因() A.咬上唇 B.咬下唇 C.乳尖牙磨耗不足 D.多数 发布时间:2017-04-16 23:07 │ 来源:www.tikuol.com 题型:单项选择题 问题: 下列哪项不是乳前牙反的病因()A.咬上唇B.咬下唇C.乳尖牙磨耗不足D.多数乳磨牙早失E.下颌前伸习惯
题型:单项选择题 Find out the mistakes and correct them. 找出错误并改正。( ) 1. Li Ming works hardly at school. A B C ( ) 2. Jenny feels a few sad. A B C ( ) 3. May I go skiing and Steven? A B C ( ) 4. I usually go home in 7:00. A B C ( ) 5. Yesterday I maked supper for my family. A B C 查看答案
题型:单项选择题 如图所示,理想变压器原线圈接u=220sin100πt (V)的 正弦交流电源,图中电流表内阻不计.副线圈接入“110V,60W”灯泡一只,且灯光正常发光.下列说法正确的是( )A.电流表的示数为3/11 A B.通过灯泡的电流的频率为50HzC.电流表的示数为3/22 AD.理想变压器原、副线圈匝数之比为2:1 查看答案