PCR技术是当今分子生物学使用最多的技术之一,它一般都有________、________、________三个基本反应步骤构成。
参考答案:变性 退火 延伸
输澳大利亚植物产品熏蒸处理,可在附加声明中注明()
A.Plastic wrapping has not been used in this consignment
B.This consignment has been fumigated before application of plastic wrapping
C.Plastic wrapping used in this consignment conforms to the AQIS wrapping and perforation standard as found in the AQIS Methyl Bromide FumigationStandard
D.FUMIGATION COMPANY:企业名称
航迹舵在()会发出报警指示。
①自动校正风、流压影响时;
②航向修正量过大时;
③定位接收仪长时间无船位时。
A.①、②、③;
B.①、②;
C.①、③;
D.②、③。