结构动力特性参数与外荷载无关。( )

The phrase 'make a grab'(Line 5, Para. 4)is closest in meaning to______.A．realize huge profitsB．make a great changeC．face a fierce competitionD．take collective actions 点击查看答案

What do we know about mother-reared rhesus monkeys?A．They only stay with their peers until the age of six months.B．They are not easily frightened by strange people and events.C．Their brain and body chemistry may be remarkably changed.D．They abuse or ignore their offspring when becoming mothers. 点击查看答案