题型:问答题 关于酶的性质,下列叙述错误的是[ ]A.一旦离开活细胞,酶就失去催化能力B.酶的催化效率很高,但受温度和酸碱度的影响C.化学反应前后,酶的化学性质和数量保持不变D.酶与双缩脲试剂不一定发生紫色反应 查看答案
题型:问答题 Mr. White, many customers want to see you._______ they wait here or outside?[ ]A. Will B. Shall C. Can D. Would 查看答案