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【单选题】
当点光源垂直照射在1m距离的被照面时的照度为E1时,加到3m时的照度E2=( )E1。A.
1/9
B.
1/3
C.
1/12
D.
1/6
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举一反三
【单选题】The mountain place is beautiful, but ______ the working conditions, it's terrible.
A.
when mentioned
B.
when it comes to
C.
when it is said
D.
when it dies to
【简答题】紫红色的[Ti(H2O)6]3+在可见区的吸收光谱如教材中例题3—1的图所示，其最大吸收峰位置对应于20．3×103cm-1，并在该最大吸收峰位置的右边(低频方向)出现一个肩峰，试用晶体场理论解释上述肩峰的由来。
【简答题】已计算下列盐类溶液的 pH 值和水解度 (1) 0.2 mol · L - NaAc 的溶液 (2) 0.1 mol · L - NH 4 Cl 的溶液 (3) 0.1 mol · L - KCl 的溶液
【单选题】The mountain place is beautiful, but______the working conditions, it is terrible.
A.
when mentioned
B.
when it comes to
C.
when it is said
D.
when it dies to
【简答题】计算下列溶液的 pH 值: (1) 0.1mol·L -1 的 NH 4 NO 3 溶液; (2) 在 10.0mL 0.1mol·L -1 的 HAc 溶液中,加入 5.0mL 0.lmol·L -1 的 NaOH ,溶液的 pH 值为多少? [ 已知 NH 3 的 K b Θ = 1.77×10 - 5 , HAc 的 K a Θ = 1.76×10 - 5 ]
【单选题】Under what conditions should the bypass operation be performed?
A.
When a general practitioner is available to perform. it.
B.
When there is room in the hospital emergency ward for the patient.
C.
When the patient can be expected to show favorable results.
D.
When the doctor recommends against it.
【单选题】Why was Clive puzzled when the driver spoke about the weather conditions? ______
A.
Because the weather conditions didn't look like changing.
B.
Because the driver couldn't possibly race that day.
C.
Because the driver thought conditions would be the same in Argentina.
D.
Because the distance to Buenos Aires had surprised the man.
【判断题】The fatigue failures have occurred under such conditions when the stresses developed were below the ultimate stress and frequently below the yield strength.
A.
正确
B.
错误
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