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【单选题】
可区分黄酮和二氢黄酮的是A.
NaBH 4 反应
B.
Molish反应
C.
Liebermann-Burchard反应
D.
Keller-Kiliani反应
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举一反三
【单选题】For a diesel engine, when the piston is at the _____, the clearance volume is the largest.
A.
TDC
B.
DTC
C.
BDC
D.
DBC
【单选题】Given the following data, calculate the creatinine clearance Serum creatinine = 1.5 mg/dL; urine creatinine = 102 mg/dL; urine volume = 1.8 mL/min; body surface area = 1.73 m2
A.
147 mL/min
B.
100 mL/min
C.
122 mL/min
D.
116 mL/min
【单选题】The clearance volume for a single stage compressor is defined as the space created between the （）.
A.
top of the piston and bottom side of head, with the piston at BDC
B.
piston and head, including the space around the piston to the top of the upper ring and under the valves, with the piston at TDC
C.
bottom of the piston and bottom side of the head at TDC, regardless of upper ring location and valve placement
D.
top of the piston and bottom side of the head at TDC as compared to that which exists between the top of the piston and bottom side of head at BDC
【简答题】构造套接口后,网络上具有唯一性的( )地址和( )号结合在一起,才能构成唯一能识别的标识符。
【单选题】Clearance volume scavenging in a turbocharged, four-stroke/cycle diesel engine is accomplished _____.
A.
during the valve overlap period
B.
with only the exhaust valve open
C.
at a pressure below atmospheric
D.
without cooling the cylinders or pistons
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