简述产酶细胞应具备哪些条件
参考答案:
(1)酶的产量高:
(2)容易培养和管理;
(3)产酶性能稳定;
(4)利于酶产品的分离纯化;
(5)安全可靠。
()的出现,汉字作为方块字就定型了?
She finds ______ boring ______ at home.
A.it; staying
B.that; being stayed
C.this; to stay
D.it; stayed