【判断题】测定核酸样品溶液的A260和A280值,计算A260/ A280比值,纯的DNA样品比值为2.0
【多选题】下面关于免维护蓄电池的说法,正确的是()。
B.
采用袋式隔板可以避免活性物质脱落,又能阻止极板短路
C.
通气孔塞内装有氧化铝过滤器能阻止水蒸气和硫酸气体通过
D.
通气孔塞内装有催化剂钯能促使氢氧离子结合生成水
【单选题】It was in the lab _____ was taken charge by Professor Wang ______ they did the experiment.
【单选题】Professor Wang said that he would rather his student Jane__________ to the conference.
【单选题】某男孩,五岁,不小心将豌豆吸入气管,豌豆最可能会进入小儿的?
【单选题】根据劳动合同法律制度的规定,用人单位需承担的义务有( )
A.
告知劳动者工作内容、工作条件、工作地点、职业危害、安全生产状况、劳动报酬等
【单选题】Professor Wang _______to give us a talk next week. ――Really ? That is good news .
【单选题】Let's go to visit Professor Wang, ______ we?
【单选题】Professor Wang has no time to go with us because his work is ________.
【多选题】根据劳动合同法律制度的规定,用人单位需承担的义务有()。
A.
告知劳动者工作内容、工作条件、工作地点、职业危害、安全生产状况、劳动报酬等