In dive-gathering mining method, the miner sinks after loading counterweights at the surface.

中国大学MOOC: It’s a ball that sinks because it’s filled_____ salt water.

A long-term ____________ between these natural sources and sinks leads to the background, or natural, level of CO₂ in the atmosphere.

中国大学MOOC: Thefollowing sentences are from one paragraph. Decide which one is the topic sentence of the paragraph?1)In time, this melted part rises as a magma.2)The formation of a volcanic eruption is a dramatic series of events.3)As the plate sinks, friction and the earth’s heat cause part of it to melt.4)The magma produces heat, steam, and pressure.5)First of all, most volcanoes are formed where two plates collide.6)Then one of the plates is forced under the other and sinks.7)When the heat, steam, and pressure from the magma finally reach the of the Earth, volcanic eruption occurs.

It’s a ball that sinks because it’s filled_____ salt water. A: of B: with C: out D: in

The integrator block is included in the ( ) block library. A: Sources B: Sinks C: Continuous D: Math Operations

Scope模块包含在（ ）模块库中。 A: Math Operations B: Sources C: Subsystems D: Sinks

Soilsare considered as for trace elements, and therefore they play an important role in the environmental cycling of elements. A: sources B: origins C: basin D: sinks

Simulink中常用的阶跃信号模块位于()模块库中。 A: Math Operations B: Sources C: Sinks D: Continuous

Which of the following is not one of Tthe three types of sustainable<br/>rates refers to the following but () A: Fossil<br/>fuel B: Renewables C: Non-renewables D: Environmental<br/>sinks