未知题型 It is not easy to ______ oneself of his bad habits, just as the proverb says, 'Old habits die hard'.A.removeB.killC.dismissD.rid
单项选择题 如图所示悬臂梁,当单独作用力F时,截面B的转角为θ,若先加力偶M,后加F,则在加F的过程中,力偶M( )。
未知题型 The word 'paramount' (Paragraph 4) may be replaced by ______.A.vitalB.more importantC.less importantD.similar