桥梁橡胶活动支座应选用()
A. 矩形板式
B. 圆形板式
C. 矩形四氟板式
D. 球形冠状
关于/y/的音位变体,下列音标正确的是()。
A. 区[tþÁy]
B. 群[tþÁyn]
C. 月[çE]
D. 圆[çan]
ThemostsignificantfeatureofIrishlandscapeis()whichprovidepeatusedforfuel.
A. bogs
B. streams
C. islands
D. cliffs
Irelandhasthefollowingdemographicfeaturesexcept().
A. ithasalowbirthrate
B. ithasalatemarriageage
C. ithasanexcessoffemalesinthepopulation
D. ithasahighproportionofbachelorsandspinstersofallages