目前凝胶内沉淀反应中最常用的凝胶是()
A.Percoll
B.Ficoll-Hypaque
C.琼脂和琼脂糖
D.聚丙烯酰胺凝胶
E.淀粉
参考答案:C
— Is it OK to take this seat — Sorry,().
A. here you are
B. take it
C. it's taken
D. never mind
当某一缸的高压油管有泄漏或喷油器故障而导致燃油喷射量超过限值时,()会动作,切断该缸的燃油供应。
A.轨压限制阀
B.流量限制阀
C.输油泵
D.压力控制阀