WhenthedelegatesmetatPhiladelphiain1787,theirtaskwas()
A. towriteanewconstitution
B. toseewhattheycandoabouttheArticlesofConfederation
C. todesignanewformofgovernment
D. torevisetheArticlesofConfederation
亮度的单位是()。
A. Lx
B. cd
C. Lm
D. cd/m
摩擦式提升机为防止主绳打滑,新钢丝绳在悬挂前一定要用柴油清洗干净,柴油要使用蒸汽加温,一般应使温度掌握在()之间。
A. 60℃-70℃
B. 70℃-80℃
C. 50℃-60℃
TheHouseSpeakerandthetemporaryPresidentoftheSenateareusually()
A. electedbythemajorityparty
B. chosenfromthemajorityandminorityparties
C. membersofthemajorityparty
D. chosenfreelyfromtheCongressmenandSenators