题目内容
（请给出正确答案）
[主观题]
德国莱比锡“世界最美的书”评选工作圆满结束，获得2009年度“中国最美的书”称号的《诗经》一
书，荣获今年“世界最美的书”称号。参加评选活动的共有32个国家和地区，参评图书达到634种，总品种数较去年增长1．28％。中国获奖图书《诗经》由刘晓翔设计，因其典雅、质朴而不失创意获得专家们的青睐。
如搜索结果不匹配，请 联系老师 获取答案
With a given load on the cargo hook，the thrust on a cargo boom ______.
A.increases as the angle to the horizontal increases
B.increases as the angle to the horizontal decreases
C.is greatest at an angle of 45° and decreases as the boom is raised or lowered
D.is least at an angle of 45° and increases as the boom is raised or lowered
