【单选题】VOC是()(volatile organic compounds)的简称。
【简答题】Volatile organic (VOCs) are organic chemicals that form a gas at room temperature. (compounds / complexes)
【简答题】volatile organic compounds (VOCs)
【单选题】What the plants pump through the air is a mixture of chemicals known as volatile organic compounds, VOCs _____ _______.
【多选题】与次等劳动力市场相比,优等劳动力市场的特征包括( )。
【简答题】In contrast to inorganic compounds, the molecular attraction of organic compounds is weak, so organic compounds are usually volatile and possess low melting points.
【单选题】下列选项中,对细菌杀虫剂-苏云金芽孢杆菌描述不正确的是:()。
A.
该菌对鳞翅目、双翅目、膜翅目、鞘翅目、直翅目和毛翅目等多种昆虫有不同程度的致病性
C.
内毒素是最主要的杀虫毒素,它伴随着芽孢的形成而产生