复数（i是虚数单位）的共轭复数的虚部为 A. B.0 C.1 D.2
将一种浓度为15的溶液30，配制成浓度不低于20的同种溶液，则至少需要浓度为35的该种溶液____________.
Tell your car to make a phone call without holding the phone．Tell your car to send an e-mail without touching the computer or even tell your car to send a call for help．Sound like something from a
摘除大白鼠的胰腺，将胰腺的一部分再植入大白鼠的皮下，该动物未出现糖尿病的症状；一段时间后，将皮下的移植物（胰腺组织）除去，该大白鼠立
Simon_______ running and Jim_______ swimming. A. is good at; do well in B. is good at; does well in C. be good at; do well in D. be
阅读下面的文字，完成下列各题 提 琴 [美国]保·琼斯 从我幼年时一直到长大离开家上大学，甚至在那之后，我舅舅迈克的小提琴一直被视为家中
下列物质在常温常压下为液体的是A．乙醇 B．异丁烷 C．乙烯 D． 一氯甲烷
I have a TV. She also _______ a TV. A. have B. has C. is D. are
