如图所示,汽车的质量为1.5×104 kg,以不变的速率先后驶过凹形桥与凸形桥,桥面圆半径15m,如果桥面承受的最大压力不得超过2×105N,汽车允许的最大
He ________ his last chance of winning the election when he said the wrong thing on TV. A.gave off B.gave away C.gave in
下列各式①;②;③;④;⑤;其中一定是最简二次根式的有( ) A.4个 B.3个 C.2个
— ______ useful tool the computer is! — I agree. It’s ______ interesting as well.A. What a ; / B. How a; the C. What an; / D How an;
.(9分)Ⅰ:选择一种试剂鉴别下列各组物质,将所选试剂的化学式或名称写在横线上:① 苯、甲苯 ▲ ② 苯、硝基苯、乙醇 ▲ ③
下列哪项不是生物生活所必需的基本条件? ( ) A.阳光 B.生存空间 C.空气
新江厦商城对销量较大的A、B、C三种品牌的洗衣粉进行了问卷调查,发放问卷270份(问卷由单选和多选题组成).对收回的238份问卷进行了整理,部分数据
Yao Ming has been nominated for the Naismith Memorial Basketball Hall of Fame, which probably him the first Chinese player to receive the honor. A.makes B.has