Emulsion oils and sodium nitrite are both approved additives, but the latter cannot be used if any pipes are or if ally soldered joints exit.
A. chromed
B. welded
C. galvanized
D. bolted
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价格水平的上升________。
A. 使得货币的购买力提高
B. 降低了出口产品的价格
C. 降低了货币的购买力
D. 增加了总需求
E. 使得总需求曲线更为陡峭
The International Oil Pollution Prevention Certificate is valid for a period of______.
A. one year from the date of issue
B. five years from the date of issue
C. three years from the date of issue
D. four years from the date of issue
图19—8显示出________。
A. 一个充分就业均衡
B. 高于充分就业均衡，存在通货膨胀缺口
C. 高于充分就业均衡，存在衰退缺口
D. 低于充分就业均衡，存在通货膨胀缺口
E. 低于充分就业均衡，存在衰退缺口
What is the best explanation to the underline phrase "to secure the smooth withdrawal of ships"？
A. To withdraw a ship mid make it in a safe condition
B. To secure the life of a ship and recycle it
C. To break a wreck
D. To finish the service of a ship and break it without other problems
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