皮皮学，免费搜题
登录
搜题
【多选题】
有关移液管使用方法正确的叙述是A.
移液管用前一定要干燥
B.
放液时移液管要垂直
C.
不允许将尖端残留的液体吹入接受瓶
D.
放液毕，应等待30秒
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】In the story told by Dave Barber, ______.
A.
he was finally saved by his grandmother
B.
he was finally saved by his nine-year-old son
C.
he would have been drowned if his grandmother had not lifted him
D.
he would have been taken away by his grandmother if his son had not dragged him down
【单选题】下列有关基因的叙述，错误的是 [ ]
A.
原核生物的基因和真核生物的基因化学本质不同，结构不同
B.
病毒可在基因工程中作运载体
C.
利用基因工程可生产胰岛素
D.
基因工程中用人工合成法获得的真核生物的目的基因无内含子
相关题目：