【单选题】The main idea of the first paragraph is ______.
A.
the danger of our world
B.
the importance of conservation
C.
that we're destroying ourselves
D.
that we are changing our world
【单选题】为防止侧向雷击,在高层建筑物中,每三层在结构圈梁内敷设一条
【单选题】关于发电机欠压故障的处理方法叙述正确的是____。(1)对带有延时的发电机欠压保护,若船舶发电机的电压降低至额定电压的70%~80%,欠压保护延时1~3s后动作导致主开关跳闸时,管理人员应对欠压保护的整定值进行校验和重新设定(2)船舶发电机的欠压保护是由自动空气断路器中的失压脱扣器来实现的(3)发电机调压器失灵,发电机外部持续性短路故障、 欠压保护的参数失调等,都能引起发电机欠压保护动作,管理人员...
【单选题】The little girl was ________ losing her life, but she is now ________. [ ]
A.
in the danger of; out of danger
B.
in danger of; out of the danger
C.
in the danger of; out of the danger
D.
in danger of; out of danger
【单选题】They are determined to go into the dark cave, ______ my warning of danger.
【单选题】( )是大自然的色彩,能使人产生和平、宁静、安全、年轻的感觉。
【单选题】使人产生和平、宁静、安全、年轻的感觉,大自然的色彩是( )。
【单选题】( )是大自然的色彩,能使人产生和平、宁静、安全、年轻的感觉。
【单选题】According to recent reports, one of the rare animals, _____ crocodile, is in _____ danger of dying out. [ ]