呈现明亮的黄绿色荧光的是().
A.异硫氰酸荧光素
B.四乙基罗丹明
C.四甲基异硫氰酸罗丹明
D.藻红蛋白
E.镧系螯合物
参考答案:A
Only if you put ______ sun there did the movements of the other planets in ______ sky make sense.
A.the; 不填
B.the; the
C.不填; the
D.a; the
(EMB145)APU点火系统的点火激励器有()个。
A.1
B.2
C.3
D.4