保护接地是用以防止间接接触电击最基本的安全措施之一,它主要适用于哪些系统或电网？

A. it has the opposite opinion to the book written by the two girls.
B. it has ranked first on the list of best sellers for several times.
C. it has the same theme with the book written by the two girls.
D. it is another book that the two girls have ever written.

A. It is the result of the rise of stock markets.
Because bank shares have risen especially strongly.
C. Because the debts of governments such as Greece and Portugal have fallen.
D. Because the central banks began to buy governments debts in the markets.

A. In Harness : the Male Condition.
B. Different Roles of Men and Women.
C. How to Solve Men"s Problems.
D. Survival Instincts vs. Male Images.