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【单选题】
I know you are very busy. I really appreciate your help, and want to tell you that help has encouraged me to work harder. What may these sentences be excerpted from?A.
A letter of recommendation
B.
A letter of thanks
C.
A letter of invitation
D.
A letter of asking for help
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举一反三
【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（）
A.
AFP（+）
B.
胸片
C.
γ-GT
D.
CT
E.
CEA（-）
【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 。
【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 ()
A.
心电图
B.
心脏超声
C.
血、尿中儿茶酚胺及 VMA测定
D.
尿中 17-羟皮质类固醇检查
【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
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