Which of the following can be directly obtained by means of an indicator card?（）

Which is an acceptable means of correcting high mica between commutator bars?（）

In order to prevent galvanic corrosion，an aluminum boat must be insulated from the davits and gripes. Which of the following is acceptable as an insulator?（）

The main bearing shells are made of steel with a lining of bearing metal which may be white metal, copper-lead or aluminum-tin alloy What is the meaning of “which” in the sentence above?（）

The important thing is that this is a major breakthrough. “breakthrough” here means an important development or achievement.

保持安全值班的目的包括：（） Ⅰ、避免船舶发生碰撞事故Ⅱ、避免船舶发生火灾Ⅲ、避免船舶污染环境

船长应负责保管的船舶安全管理方面的证书有（）。 Ⅰ．符合证明； Ⅱ．符合证明的副本； Ⅲ．船舶安全管理证书； Ⅳ．船舶安全管理证书的副本。

（）means the sufficiency of a vessel in materials，construction，equipment，crew，and outfit for the trade or service in which it is employed.

Canberra,the capital of Australia,got its name from the word "Canburry",which is an Aboriginal word meaning（）

Which of the following storage devices is not an example of an optical storage device?（）

The frequency of an AC generator is adjusted by means of the （）

In many installations basket strainers consist of a cylindrical container in which a perforated metal or wire basket is suspendedThe bold and italic word “which” means （）.