L是半径为a,圆心在原点的上半圆周,则等于()。 A.A B.B C.C D.D 发布时间:2017-12-13 21:05 │ 来源:www.tikuol.com 题型:单项选择题 问题: L是半径为a,圆心在原点的上半圆周,则等于()。A.AB.BC.CD.D
题型:单项选择题 从方框中选择合适的选项完成对话(其中有一项多余)。A: Hi, Peter. Can you come to my party this Saturday?B: Party? What party?A: 1 B: Really? Happy birthday to you. Donna. I'd love to.__2 A: At 6 p.m., October 25th, at my house. Do you know my address? No. 108 Green Street. If you can't find it, give me a call, 24067596. By the way, 3 B:OK. 4 A. What time? B. It’s my 15th birthday. C. Thanks for your invitation? D. Can you ask Ann to come together? E. That’s all right. 1. 2. 3. 4. 查看答案
题型:单项选择题 对下列几种微生物的叙述中,正确的是()①酵母菌②乳酸菌③硝化细菌④蓝藻⑤烟草花叶病毒⑥噬菌体A.从组成成分上看,所有生物都含有蛋白质和DNAB.从结构上看,①为真核生物,②③④⑥为原核生物C.从同化作用类型上看,①②为异养型,③④为自养型D.从生态系统的成分上看,①②③是分解者,④是生产者 查看答案