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【单选题】
The war was the most peaceful period of my life. The window of my bedroom faced south-east. I always woke up with the first light and, with all the responsibilities of the previous day melted, felt myself rather like the sun, ready to shine and feel joy. Life never seemed so simple and clear and full of possibilities as then. I stuck my feet out under the sheets--I called them Mrs. Left and Mrs. Right--and invented dramatic situations for them in which they discussed the problems of the day. At least Mrs. Right did she easily showed her feelings, but I didn't have the same control of Mrs. Left, so she mostly contented herself with nodding agreement. They discussed what Mother and I should do during the day, what Santa Claus should give a fellow for Christmas, and what steps should be taken to brighten the home. There was that little matter of the baby, for instance. Mother and I could never agree about that. Ours was the only house in the neighborhood without a new baby, and Mother said we couldn't afford one till Father came back from the war because it cost seventeen and six. That showed how foolish she was. The Geneys up the road had a baby, and everyone knew they couldn't afford seventeen and six. It was probably a cheap baby, and Mother wanted something really good, but I felt she was too hard to please. The Geneys' baby would have done us fine. Having settled my plans for 'the day, I got up, put a chair under my window, and lifted the frame. high enough to stick out my head. The window overlooked the front gardens of the homes behind ours, and beyond these it looked over a deep valley to the tall, red-brick house up the opposite hillside, which were all still shadow, while those on our side of the valley were all lit up, though with long storage shadows that made them seem unfamiliar, stiff and painted. The boy usually felt ________ early in the morning.
A.
frightened
B.
cheerful
C.
worded
D.
puzzled
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【简答题】如图所示,轻弹簧的一端固定在倾角为 a 的光滑斜面的底端 E ,另一端与质量为 m 的物体 C 相连, O 点为弹簧原长处, A 点为物体 C 的平衡位置, x 0 为弹簧被压缩的长度.如果在一外力作用下,物体由 A 点沿斜面向上缓慢移动了 2 x 0 距离而到达 B 点,则该外力所作 功为 ____
【单选题】如图所示,一个质量为 m 的滑块置于倾角为 30 °的固定粗糙斜面上,一根轻弹簧一端固定在竖直墙上的 P 点,另一端系在滑块上的 p 点,直线 PQ 与斜面垂直,滑块保持静止。则
A.
弹簧可能处于原长状态
B.
斜面对滑块的摩擦力大小可能为零
C.
斜面对滑块的支持力大小可能为零
D.
滑块一定受到四个力作用
【单选题】如图所示,一个质量为m的滑块静止置于倾角为30°的粗糙斜面上,一根轻弹簧一端固定在竖直墙上的P点,另一端系在滑块上,弹簧与竖直方向的夹角为30°。则()
A.
弹簧一定处于压缩状态
B.
斜面对滑块一定有支持力
C.
滑块一定受到四个力作用
D.
斜面对滑块的摩擦力大小可能等于零
【多选题】如图所示 , 质量为 m 的滑块置于倾角为 30° 的粗糙斜面上 , 轻弹簧一端固定在竖直墙上的 P 点 , 另一端系在滑块上 , 弹簧与竖直方向的夹角为 30°, 系统处于静止状态 , 则 ( )
A.
滑块可能受到三个力作用
B.
弹簧一定处于压缩状态
C.
斜面对滑块的支持力大小可能为零
D.
斜面对滑块的摩擦力大小一定等于
【多选题】如图所示,一个质量为m的滑块静止置于倾角为30°的粗糙斜面上,一根轻弹簧一端固定在竖直墙上的P点,另一端系在滑块上,弹簧与竖直方向的夹角为30°,则()
A.
滑块可能受到三个力作用
B.
弹簧一定处于压缩状态
C.
斜面对滑块的支持力大小可能为零
D.
斜面对滑块的摩擦力大小一定等于 mg
【单选题】下列各类药物中,具有降血脂作用的是
A.
羟甲二戊酰辅酶A还原酶抑制剂类
B.
钙通道阻滞剂
C.
血管紧张素转化酶抑制剂
D.
强心苷类
E.
磷酸二酯酶抑制剂
【单选题】如图所示,一轻弹簧下端拴接在倾角为 θ 的光滑固定斜面底端,弹簧处于原长时上端位于斜面上的 B 点,可视为质点的物体以一定初速度从 A 点开始沿斜面向下运动,从物体与弹簧接触到弹簧压缩到最短的过程中,弹簧对物体的弹力 F 、物体的加速度 a 、物体的动能 E k 以及物体的机械能 E 与弹簧压缩量 x 的关系图线如选项图所示。不计空气阻力,弹簧始终在弹性限度内,以沿斜面向下为正方向建立坐标系,则选...
A.
B.
C.
D.
D
【简答题】怎样夸人更合适呢?
【多选题】下列事项属于我国劳动法对女职工劳动权益保护的有
A.
女职工不能从事矿山井下作业
B.
怀孕七个月以上的女职工不得安排其夜班劳动
C.
女职工生育享有不少于90天的产假
D.
哺乳期女职工不得被安排加班加点
【单选题】下列各类药物中,具有降血脂作用的是
A.
羟甲戊二酰辅酶A还原酶抑制剂类
B.
钙通道阻滞剂
C.
血管紧张素转化酶抑制剂
D.
强心苷类
E.
磷酸二酯酶抑制剂
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