主页
学科
搜索
账户
常见问题
当前学科：口腔设备学
题目：
单选
一台新的技工用微型电机，使用时发现夹头发热并伴有异常声音，造成这种现象的最可能原因是（）。
A . 夹头有故障
B . 轴承损坏
C . 碳刷磨损
D . 微电机有短路故障
E . 车针不符合标准或未安装到位
答案：
<查看本题扣1积分>
查看答案
答案不对？请尝试站内搜索
推荐知识点:
患者李先生准备接受腹腔镜下胆囊切除术，主刀医生除了向李先生及其家属耐心解释手术的目的，预期效果及本手术的替代治疗方案等外，还向李先生说明手术不一定能确保达到理想的预期效果、手术存在风险及可能引起的并发症。您认为主刀医生的做法是：（）
战略投资者不得参与首次公开发行股票的初步询价和累计投标询价，并应当承诺获得本次配售的股票持有期限不少于12个月，持有期自本次公开发行的股票上市之日起计算。（）
参与蛋白C激活的物质是凝血酶。()
对子宫动脉的描述，不正确的是（）。
社区制的突破()
银行职能风险经理设置于风险管理、信贷管理、授信执行、资产处置等部门。
“一叶障目，不见泰山。”这种思维方式属于（）
Every year just after Christmas the January Sales start．All the shops reduce their pricesand for two weeks，they are full of people looking for bargains．My husband and I do not nor-mally go to the sales as we don’t like crowds and in any case are short of money as we have tobuy lots of Christmas presents． Last year，however，I took my husband with me to the sales at the large shop in the centerof London．We both needed some new clothes and were hoping to find a television set．Whenwe got to station．So I left my husband and started looking around the shops．Unfortunately allthe clothes were in very large sizes and SO were not suitable for me．But I did buy．a televisionat a very cheap price，SO I felt quite pleased with myself． When I arrived at the station，my husband was not there．So I sat down in a nearby cafeto have a cup of tea．I quickly finished my tea when I saw my husband and went out to meethim．He looked very happy．Then I saw he Was carrying a large and heavy cardboard box．“Oh，dear!”I thought．Yes，we had no new clothes but two televisions．We shall not be going to the sales again． 根据以上内容，回答题。In January__________．
女性，44岁，G3P1，因侵蚀性葡萄胎收入院治疗。检查：BP100/60mmHg，R18次/分，P92次/分，双合诊检查提示子宫丰满、质软，血HCG明显高于正常值。。患者用药第5天后出现口腔溃疡，以下做法不正确的是（）。
SQ21型切丝机的液压系统使刀门压力不足的原因分析及排除过程。