问题
多项选择题
以下哪种情况下，需要摘除联锁。（）
A.对涉及到联锁的现场仪表进行检修
B.对联锁保护输入输出卡件进行检修
C.对SCADA系统进行巡检
D.联锁保护周期校验
答案
参考答案：A, B
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以下哪种情况下，需要摘除联锁。（）
A.对涉及到联锁的现场仪表进行检修
B.对联锁保护输入输出卡件进行检修
C.对SCADA系统进行巡检
D.联锁保护周期校验
参考答案：A, B
| Some people associate migration mainly with birds. Birds do travel vast distances, but mammals also migrate. An example is the caribou, reindeer that graze on the grassy slopes of northern Canada. When the weather turns cold, they travel south until spring. Their tracks are so well-worn that they are clearly visible from the air. Another migrating mammal is the Alaska fur seal. These seals breed only in the Pribilot Islands in the Bering Sea. The young are born in June and by September are p enough to go with their mothers on a journey of over 3,000 miles. Together they swim down the Pacific Coast of North America. The females and young travel as far as southern California. The males do not journey so far. They swim only to the Gulf of Alaska. In the spring, males and females all return to the islands, and there the cycle begins again. Whales are among the greatest migrators of all. The humpback and blue whales migrate thousands of miles each year from the polar seas to the tropics. Whales eat huge quantities of plankton. These are most abundant in cold polar waters. In winter, the whales move to warm waters to breed and give birth to their young. |
Together ______ of Alaska fur seals swim down the Pacific Coast of North America.
A．mothers and the young
B．fathers and the young
C．parents and the young
D．seals and whales