The officer in charge of the navigational watch shall not hand over the watch to the relieving officer if（）. ["there is reason to believe that the latter is not capable of carrying out the watchkeeping duties effectively","the ship is fitted with automatic steering","there is daylight or darkness","at no time shall the bridge be left unattended"]
主要测点所用变送器，应至少每3年定检一次。
行政处罚决定执行完毕，工商行政管理机关应当及时将案件材料立卷归档，下列哪些材料应当归入正卷（） ["A.立案审批表","B.听证报告","C.听证笔录","D.核审意见"]
下列哪一项交易需要主管授权（）。 ["A.定期扣款入口交易（000899）","B.补登存折（000600）","C.发放\/重发定期存单（000501）","D.建立取款通知（000927）"]
A crankshaft whose center of gravity coincides with its center line is said to be（） Ⅰ.statically balanced Ⅱ.dynamically balanced ["Ⅰ only","Ⅱ only","both Ⅰ and Ⅱ","neither Ⅰ nor Ⅱ"]
什么是调频叶片和不调频叶片？调频叶片安全工作的准则是什么？不调频叶片安全工作的条件是什么？为什么有些叶片一定要用不调频叶片安全评价标准来评价？
