Many millions of people have high blood pressure(hypertension 高血压). What's so frightening about this so called silent killer is that it often does not produce (51) for years, secretly damaging arteries and organs throughout the body until it erupts (爆发) in the form. of stroke, heart attack, congestive heart failure(充血性尽力衰竭) or kidney disease. (52) left untreated, even mild hypertension can reduce the life expectancy of a 35-year-old (53) several years. (Readings of 140 to 159 over 90 to 99 are mildly high; about 120/80 is normal. )
That's why high blood pressure is commonly treated with anti-hypertensive drugs. But studies (54) that in some people an increase in calcium(钙) consumption can help (55) blood pressure without medication(药物治疗)。
Calcium also seems to help prevent high blood pressure. (56) the results of 13-year survey (57) by the U.S. National Center for Health Statistics, James H. Dwyer, associate professor of (58) medicine at the University of Southern California School of Medicine, found that people who consumed 1300 milligrams of calcium a day were 12 percent (59) likely to develop hypertension than those (60) only 300 mg. a day. In people under age 40, risk was reduced by up to 25 percent.
Soon doctors may (61) some hypertension patients to increase their calcium intake, (62) the way they now advise sodium(钠) restriction. "It's (63) to add food or supplements than to go on a low-sodium diet," (64) Dr. David McCarron, professor of medicine at Oregon Health Sciences University. "Our studies show that people who try the low-sodium (65) don't stay with it very long. "
(51)
A.evidence
B.symptoms
C.marks
D.sign
第1题
A.500总吨及以上
B. 750千瓦及以上
C. 3000千瓦及以上
D. 3000总吨及以上
第2题
A.高级船员4人、机工3人
B.高级船员4人、值班机工3人
C.高级船员5人、机工4人
D.高级船员5人、值班机工4人
第3题
A.能在驾驶台遥控主机,但机舱的集控室需要有人值班
B. 能在驾驶台遥控主机,机舱的集控室可周期无人值班
C. 能在机舱集控室控制主机
D. 不能在驾驶台遥控主机,机舱有人值班
第4题
A.①②③④
B.①②3
C.①③④
D.③④
第5题
A.负责航行值班的高级船员在值班时间内始终在驾驶台或与之直接相连的场所,对船舶航行安全负责
B.无线电操作员在值班时间内,应始终在无线电工作室负责保持连续值守
C.负责轮机值班的高级船员,应能立即就备并随时待命到达机器处所
D.如果船上载有危险货物,值班安排应充分考虑到危险货物的性质、数量、包装和积载,以及当时船上、 水上或岸 上的任何特殊情
第6题
A.负责航行值班的高级船员在值班时间内始终在驾驶台或与之直接相连的场所,对船舶航行安全负责
B.无线电操作员在值班时间内,应始终在无线电工作室负责保持连续值守
C.负责轮机值班的高级船员,应能立即就备并随时待命到达机器处所
D.如果船上载有危险货物,值班安排应充分考虑到伧险货物的性质、数量、包装和积载,以及当时船上、水上或岸上的任何特殊情况
第7题
A.应经常到机舱督促和检查轮机部全体人员的工作
B.调整机舱无人值班机舱为有人值班
C.主机转速应随时满足驾驶台的需求
D.轮机长应适当降低主机负荷
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