The sonar devices must be placed ________.
参考答案(由小熊题库网聘请的专业题库老师提供的解答)
请点击↑↑↑ 查看官方参考答案 按钮
习题解析
请点击 查看官方参考答案 按钮
您可能感兴趣的题目
1 .When you share a fax modem, you might receive faxes for other people ________.
A save it on your hard disk B send and receive faxes C set up hardware for the fax modem D at a time E click the Close button on the toolbar F in addition to faxes intended for you
2 .When you receive a fax, you can _________.
A save it on your hard disk B send and receive faxes C set up hardware for the fax modem D at a time E click the Close button on the toolbar F in addition to faxes intended for you
3 .People did not begin to use unmanned vehicles in undersea exploration until recently because of _______.
A the communication problem B the ocean depths C the movement of waves D the problem of vacuum
4 .By “more challenging (Para. 6)”, the author means ___.
A more interesting B more demanding C more attractive D more dangerous
5 .Ocean exploration is not so expensive as space travel mainly because ______.
A it is not affected Earth’s gravity B most undersea vehicles operate at the end of long ropes C ROVs have been put to use D there is no need for submersibles to get away from Earth’s gravity
7 .Which of the followings is NOT MENTIONE in the passage?
A New techniques are continually developed and new machines invented for undersea exploration. B If not well built, a submersible is most likely to get crushed in deep water. C A submersible, when manned, looks very much like a spaceship. D In certain respects, undersea exploration is often faced wi...
8 .Which of the followings is NOT correct?
A Tap water reflects the concentrations of hydrogen and oxygen isotopes in different regions. B Tap water is a kind of soft drink in the United States. C Tap water contains unique proportions of isotopes of hydrogen and oxygen. D Tap water is used t cook food.
9 .James R. Ehleringer tried to find out ______.
A if our bodies break water down into its parts B if it is possible to collect hair samples across the country C if tap water contains unique proportions of isotopes of hydrogen and oxygen D if the composition of hair can indicate exactly where people are from
10 .Which of the following statements is meant by the writer?
A Ehleringer was successful in his research. B Ehleringer failed in his research. C Ehleringer can be a successful detective. D Ehleringer’s research proved successful in China.
