【简答题】When the pressure gets low, the boiling-point becomes low.
【多选题】When the low-carbon steel specimen is stretched and compressed in the axial direction, which of the following options is correct? .
A.
proportional limit s are equal
B.
yield strengths are equal
C.
ultimate strengths are equal
D.
elastic moduli are equal
【判断题】与塑料大棚相比,塑料中棚节省建材,但作业不便
【判断题】As a rule ,when the pressure of the reservoir is high,the rate of production is low; but when the pressure is low,the rate is high.
【单选题】下列不属于原癌基因与抑癌基因差别的是
A.
在功能上,抑癌基因起负调控作用,而原癌基因起正调控作用
B.
在遗传方式上,原癌基因是显性的,而抑癌基因在细胞水平上是隐性的
C.
在突变发生的细胞类型上,抑癌基因突变可以发生在体细胞中,也可能发生在生殖细胞中并通过生殖细胞得到遗传。原癌基因突变只发生在体细胞中
D.
从表达水平上,原癌基因表达水平高,抑癌基因表达水平低
【单选题】In the Northern Hemisphere, when the low pressure center at your location is northerly, causing the wind is located to your ______.