下列关于质点处于平衡状态的说法,正确的是 [ ]
A.质点一定不受力的作用
B.质点一定没有加速度
C.质点一定处于静止状态
D.质点一定处于匀速运动状态
答案:B
读图回答问题
小题1:图中甲、乙、丙、丁四地既位于低纬度地区,又位于西半球的是 ( )
A.甲
B.乙
C.丙
D.丁小题2:以下关于甲、乙、丙、丁四地的说法正确的是( )
①丙丁两地地方时相同
②乙丙两地地方时相同
③丙丁两地昼夜长短相同
④乙丙两地昼夜长短相同
⑤一年中甲丁两地正午太阳高度变化幅度相同
⑥夏至日时图中四地正午太阳高度和白昼长度均达到最大值
A.①③④
B.①⑤⑥
C.②④⑥
D.①④⑤
—You haven't said a word about my new coat, Brenda. Do you like it?
—I'm sorry. I anything about it. I certainly think it's pretty on you.[ ]
A. wasn't saying
B. don't say
C. won't say
D. didn't say