无权代理中，被代理人的追认权在性质上属于（）
A.形成权
B.抗辩权
C.支配权
D.请求权
参考答案：A
钻井液密度过小易发生（）事故。
A、损害油气层
B、压差卡钻
C、井喷、井塌
D、憋漏地层
When an object is dropped, the number of feet N that it falls is given by the formula , where t is the time in seconds since it was dropped and g is 32.2, if it takes 5 seconds for the object to reach the ground, how many feet does it fall during the last 2 seconds ？（）
, where t is the time in seconds since it was dropped and g is 32.2, if it takes 5 seconds for the object to reach the ground, how many feet does it fall during the last 2 seconds ？（）