【单选题】Which of the following is TRUE according to the passage?
A.
Water is a barrier to radio communication.
B.
Lasers have found wide application in submarine communication.
C.
Water absorbs all kinds of electromagnetic waves.
D.
Very low frequency radio waves cannot be used to contact submarines.
【单选题】Which of the following statements is TRUE regarding crane operations ________.
A.
Radio communications allow the crane operator to disregard the use of hand signals
B.
The crane operators and signalman must be familiar with the correct hand signals
C.
The forward cranes can be operated from the bridge
D.
The aft cranes can be operated from the aft steering station
【单选题】The passage suggests which of the following about coral reef communities?
A.
Coral reef communities may actually be more likely to thrive in waters that are relatively low in nutrients.
B.
The nutrients on which coral reef communities thrive are only found in shallow waters.
C.
Human population growth has led to changing ocean temperatures, which threatens coral reef communities.
D.
The growth of coral reef communities tends to destabilize underwater herbivore populations.
E.
Coral reef communities are more complex and diverse than most ecosystems located on dry land.
【单选题】It can be inferred from the paragraph 2 which of the following is right?
A.
Comm badge is a communicator that only exist in science fiction.
B.
Comm badge is widely used in Iraq for war purposes.
C.
Comm badge is an intelligent new device of voice-driven wireless communication.
D.
Comm badge is a mere walkietalkie that appeals to 'Star Trek' fans.
【判断题】案例中员工小马作为下属他没有把自己和同事想去参加培训的意愿让领导知道,领导也不可能面面俱到,了解每个员工的适时想法。
【判断题】蒸气压缩式制冷是利用液态制冷剂气化时吸热,蒸汽凝结时放热的原理进行制冷的。
【单选题】关于巩膜的叙述,错误的是
C.
中年后在内毗部可出现黄色斑块,为脂肪沉着所致
E.
血液中其他黄色色素成分增多时一般巩膜黄染出现在远离角膜处
【单选题】Which of the following statements is true about Mike McWilliams?
A.
He rides a scooter commuting.
B.
He drives a car to work sometimes.
C.
He is a new motorcyclist.
D.
He works at a community college.