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【单选题】
Helmholtz free energy is a thermodynamic potential that measures the useful work obtainable from a closed thermodynamic system at:A.
A constant temperature and pressure
B.
A constant temperature and volume
C.
A variable pressure and variable temperature
D.
None the above
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【单选题】在一次体育测试中，小芳所在小组8人的成绩分别是：46，47，48，48，49，49，49，50，则8人体育成绩的中位数是（ ）
A.
47
B.
48
C.
48.5
D.
49
【简答题】估算。 304+4988 ≈ 4139 ÷48 ≈ 703 ×49 ≈ 6943-2150 ≈
【简答题】间歇操作反应器中,任何部位反应物料的浓度随时间 。(改变,不改变) 。
【简答题】估算 416÷70≈ 120÷39≈ 49×5≈ 507×48≈
【单选题】Activity-level variances plus flexible-budget variances equals:
A.
total master-budget variances
B.
total standard variances
C.
total actual variances
D.
None of these answers is correct.
【单选题】The test for the equality of two population variances is based on the
A.
ratio of the two sample variances
B.
difference between the two sample variances
C.
difference between the two population variances
D.
difference between the sample variances divided by the difference between the sample means
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