【简答题】三相半波可控整流电路中的三个晶闸管的触发脉冲相位按相序依次互差 ,当它带 电阻 负载时, α 的移相范围为 ; 当它带阻感负载时, α 的移相范围为 。
【单选题】患者,男性,60岁,普查发现肝左叶占位7cm。体检检查无阳性发现,肝肾功能正常下列哪项检查最有助于诊断原发性肝癌()
【简答题】为保证建筑物配件的安装与有关尺寸间的相互协调,在建筑模数协调中把尺寸分为标志尺寸、构造尺寸和实际尺寸。构件的构造尺寸大于构件标志尺寸。 判断对错
【单选题】—Why! I ____ get you on the phone.— We ______ basketball on the playground when you phoned.A.did
A.
30. —Why! I ____ get you on the phone. — We ______ basketball on the playground when you phoned. A.didn’t; must have been playing
B.
didn’t; must be playing
C.
couldn’t; must have played
D.
couldn’t; must be playing
【简答题】三相半波可控整流电路中的三个晶闸管的触发脉冲相位按相序依次互差 ,当它带阻感负载时,的移相范围为 。
【判断题】由于新开的店铺级别较低,在和别的商家交换友情链接时,经常会被拒绝。但一定不能放弃,要有信心与毅力。 ( )
【单选题】产成品入库,需由( )部门先行点验和检查,然后签收。签收后,填制产成品入库单,并将实际入库数量通知会计部门。
【判断题】国防动员的主要内容中,战争动员的核心是国民经济动员。( )
【单选题】女性, 60岁,近1个月以来,发作性血压升高达28/16kPa(210/120mmHg),伴心悸,大汗、头痛,症状持续1小时后可自行缓解,血压恢复正常。 可选用下列哪项检查有助于诊断 ()
【单选题】Why! I __get you on the phone. We__ basketball on the playground when you phoned.
A.
didn't; must be playing
B.
couldn't; must be playing
C.
couldn't; must have played
D.
didn't; must have been playing