图是两种致癌物质的结构简式,以下描述错误的是( )
A.(1)的分子式是C20H12
B.(2)的分子式是C10H14N2
C.它们都属于烃
D.(1)是苯的同系物
CD
关节僵硬(主要由关节囊的纤维化引起)表现()
A.主动和被动活动均正常
B.被动活动正常,主动活动障碍
C.主动和被动活动均不能
D.主动和被动活动均有部分障碍
E.被动活动正常,而不能主动活动
The table above shows the one-way driving distance, in miles, between four cities: P, Q, R, and S. For example, the distance between P and Q is 144 miles. If the round trip between S and Q is 16 miles further than the round trip between S and R, and the round trip between S and R is 24 miles less than the round trip between S and P, what is the value of X ?()
A. 174
B. 182
C. 186
D. 348
E. 364