车工作业实施

小明看到在没有起重机的情况下,工人要将 油桶搬运上汽车,常常用斜面,小明想：为什么不直接将油桶抬上车呢?难道这样做可以省力吗?如果能省力那么推力的大小与斜面长度有关吗?为了探究 碳酸根和碳酸氢根的酸性哪个强些? The sick boy-- go to school A.doesn't need B.needn't to C.doesn't need to D.don't need to 物理的题,我不懂一物体从粗糙斜面上滚下,做匀减速运动,质量为m斜面的质量为M,求地面受到的压力!答案是 大于m+M其实我就是不明白为何m做匀减速时,他受到的力小了可还是给M的磨擦力没变 COCL2的空间构型怎么判断用杂化轨道看VSEPR模型什么的判断.详细点说下过程. 怎么判断Cl2O空间构型?中心原子杂化轨道类型是什么? some recommendations for GREI appreciate you astute buddy recommending some useful books for my Analytical Writing test in general GRE,assuredly any pratical intelligence is ok.(using english question only means longing for valuable information,no of I to bear this is some burden 这里为什么要加TO,不加的话有什么不同吗 Some things to bear their own good,should not add to other people's Some things to bear their own good,should not add to other people's trouble would you like to 10___ some pictures of the little bear He must leave early特殊疑问句：Why_______________一般疑问句怎么改? He must leave early.的否定形式是什么? He must leave early否定句mustn't还是用needn't 水银防腐么?记得小时侯，水银温度计破了 漏出的小金属珠子液体 我还拿手上玩，差点就吃了，真心有余悸 水银可以防腐的吗 do the shopping和do some shopping的区别 i=nev这个物理公式是怎么推导的 公式I=nqvs求解释,物理恒稳电流里的. she wants jewelry,but she doesn't need it她想要珠宝,她又不需要?什么逻辑? she doesn't need use the calculator的同义句貌似不是呀。老师自己出的卷子 污水排入城市下水道水质标准 废水排队放水质标准 电镀废水出水质标准是什么? He____ up very late in the morning,but now he ______up bery earlyA.used to get,is used to getB.used to getting,is used to getC.is used to getting,used to getD.used to get,is used to gettingGive me a reason. I ofent get up late in the morning ang m____ the early bus. He often (miss)the early bus in the morning,because he gets up late Look at the big fire.Call the fire station,______.A.110 B.119 C.120要理由 in the face of the big fire in october in california,many people in the fire-stricken areas moved out to escape being burned. only in this way__the big fireA we can put outB can we put outC we will put outD do I put out 所谓的淀粉食物到底有那些? 麦淀粉怎么做食物好吃点啊?得了肾病,听医生的买来麦淀粉,自己做好难吃啊