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My girlfriend ______ a pen pal since she was in her early teens.
Ahad
Bhas had
Chave
Dhave had
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确定某种金属离子被滴定的最小pH值(配位滴定中,允许相对误差为±0.1%),一般根据以下哪项计算()
A、lgcMKMY≥5,lgαY(H)=lgKMY–lgK’MYB、lgcMK’MY≥6,lgαY(H)=lgKMY–lgK’MYC、lgcMKMY≥8,lgαY(H)=lgK’MY–lgKMYD、lgcMK’MY≥6,lgαY(H)=lgK’MY–lgKMY;
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10．1 have a good friend．______ name is Jane．_____ is thirteen．A． Her ； HerB． She's； SheC． Her；SheD． She；She
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She′s such an irritating woman,and I don′t know how you can__________her.A.put up
B.put up with
C.stand up with
D.stand with
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下面说法正确的是A．pH值越低，则αY(H)值越高，MY配合物越稳定B．pH值越低，则αY(H)值越高，MY配合物越不稳定C．pH值越高，则αY(H)值越低，MY配合物越不稳定D．pH值越低，则αY(H)值越低，MY配合物越稳定
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【单选题】下面程序的输出是。 main（) {enum team {my,your=4,his,her=his+10}; printf（"%d%d%d%dn",my,your,his,her);}A．0 1 2 3B．0 4 0 10C．0 4 5 15D．l 4 5 15
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用EDTA滴定金属离子M，为满足滴定要求，（误差≤0.2%）则lgαY（H）应满足的关系式是：A．lgαY（H）≥lgK(MY) +8B．lgαY（H）≤K(MY’)-9C．lgαY（H）≥lgK (MY)-8D．lgαY（H）≤ lgK(MY) -8
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用EDTA标准滴定溶液滴定金属离子M，若要求相对误差小于0.1%，则要求：（）A．CM KˊMY≥106B．CM KˊMY≤106C．KˊMY≥106D．KˊMYαY(H)≥106
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