Using benzene as internal standard, the calibration factors of derivative of aldehydes 2,4 - dinitrophenylhydrazine ( DNPH ) were measured.将醛类物质与2, 4- 二硝基苯肼 ( DNPH ) 的衍生反应液直接进样,以苯为内标物,测定了甲醛 、 乙醛等醛类物质DNPH衍生物的校正因子....
Lina is fine and sends you her love and best wishes.莉娜身体很好，还让我转达她对你的爱和祝福。She sends her best wishes — you've obviously made a hit there.她向你问好——看得出来你在那里大受欢迎。David sends his warmest regards to your parents.戴维向你的父母致以最热烈...
She was enveloped in a huge white towel.她裹在一条白色大毛巾里。Smoke from the burning house enveloped the whole street.燃烧着的房子冒出的浓烟笼罩了整条街.The land is enveloped in a curtain of darkness.夜幕笼罩着大地....
Periodically , the lamellae become enlarged, forming flattened, membrane - enclosed vesicles called thylakoids.片层周期性地扩展, 形成扁平的有膜为界的囊,称为类囊体.Mortality is the number or volume of trees periodically rendered unusable through...