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法拉第曾做过如下的实验：在玻璃杯侧面底部装一导体柱并通过导线与电源负极相连，直立的细圆柱形磁铁棒下端固定在玻璃杯底部的中心，往杯内加入水银，在玻璃杯的正上方O点吊一可自由摆动或转动的直铜棒，铜棒的上端与电源的正极相接，下端浸入玻璃杯中的水银中。由于水银的密度比铜大，铜棒会倾斜地与水银相连，此时铜棒静止，如图所示。这样，直铜棒、水银、导电柱和电源就构成了一个回路。闭合开关S，则该实验可观察到的现象是

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A.铜棒与闭合S前相比，与竖直方向的夹角不变且仍静止

B.铜棒与闭合S前相比，与竖直方向的夹角会增大些但仍可静止

C.铜棒与闭合S前相比，与竖直方向的夹角会减小些但仍可静止

D.铜棒会以磁铁棒为轴转动

答案

答案：D

问答题 简答题

潮汐的类型按照涨落潮特征有哪些？
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问答题

Turkey’s Bodrum peninsula is different. The tourist boom in this part of the world (1) turned some small villages into resorts yet left neighbouring beaches undisturbed, making it quite (2) southern France or the Spanish Coasts where few stretches of coastline are undevelopeD．
The (3) for this happy set of circumstances is simple. For thousands of years, travel here (4) easier by boat than by lanD．So when mass tourism arrived in the (5) 1980s, there was no coast road for ribbon development to follow. So the peninsula, just (6) hour from Bodrum airport, has not become one long littoral of resort.
The building (7) new hotels has mainly been confined to places easily reached by then relatively (8) roads. Such ease of access has made Gumbet, near Bodrum, a busy resort, while the little fishing village of Gumusluk, 12 miles further west and only recently reachable by (9) , remains tranquil and undisturbeD．
It’s worth thinking carefully about location when planning a family (10) on the peninsulA．Choose a place that is centrally located, preferably out of earshot (11) Bodrum town’s "lively"—which means nosy—nightlife, and you can then use (12) area’s comfortably small scale to your advantage. Today’s new roads mean most places can (13) reached in under an hour by taxi or the ubiquitous dolmus-minibus.
The (14) of facilities at the Tamarisk Beach Hotel near the small village of Ortakent makes (15) a good base. The family-run hotel—rooms and suites are in two-storey buildings (16) by palm trees and flowers in terracotta pots—sits above its own sandy (17) beach, shaded by tamarisk trees and sheltered by nearby islands.
The hotel is (18) child-friendly, too. Children, from infants up to young teenagers, can take part in a (19) of games and activities that include tuition in windsurfing, dinghy (20) catamaran sailing.

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