题型:问答题 简答题 种植基因型为AA和Aa的豌豆,两者数量之比是1:3。自然状态下(假设结实率相同),其子代中基因型为AA、Aa、aa的数量之比为[ ]A.7:6:3B.5:2:1C.3:2:1D.1:2:1 查看答案
题型:问答题 简答题 Since I won the big prize, my telephone hasn't stopped ringing. People _____ to ask how I am going to spend the money.A. phone B. are phoning C. were phoning D. will phone 查看答案
题型:问答题 简答题 用一连续精馏塔分离某二元理想混合物。已知原料液的组成为0.52(易挥发组分的摩尔分数,下同),馏出液组成为0.98,釜残液组成为0.015。若进料量为100kmol/h,则重组分的回收率为()。A、97.82% B、1.38% C、98.62% D、47.67% 查看答案