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【单选题】
在对称三相负载三角形联接中，线电流在相位上滞后相应相电流[填空(1)]。A.
30°
B.
60°
C.
90°
D.
120°
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【单选题】Which of the following are not valid Class B network IDs? _______
A.
130.0.0.0
B.
191.255.0.0
C.
128.0.0.0
D.
150.255.0.0
E.
All are valid Class B network IDs.
【单选题】Which of the following wouldNOTbe valid grounds for a provision?
A.
Aston Ltd has a policy has a policy of cleaning up any environmental contamination caused by its operations, but is not legally obliged to do so.
B.
Brum Ltd is leasing an office building for which it has no further use. However, it is tied into the lease for another year.
C.
Coleshill Co is closing down a division. The board has prepared detailed closure plans which have been communicated to customers and employees.
D.
Dudley Co has acquired a machine which requires a major overhaul every three years. The cost of the first overhaul is reliably estimated at $120,000.
【单选题】Which of the following is a valid reason for protecting an industry?
A.
The industry is unable to compete with low-wage foreign competitors.
B.
Protection penalizes lax environmental standards.
C.
Protection keeps richer nations from exploiting the workers of poorer countries.
D.
None of the above reasons is a valid reason for protection.
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