The _______ is a protein that thickens and toughens the skin and make the skin waterproof.

The exporting sewing machines in stout waterproof material, and in pairs in lightweight crates.

The roof of the residential building was constructed in August. The waterproof coiled material was paved during the day. It was found that the waterproof coiled material was bulging and leaking during the acceptance after the construction. Explain the causes of the above engineering problems.

waterproof是指“防水的”，shockproof的词义有可能是（ ）。

中国大学MOOC: The waterproof coating will _____________very quickly or after many years depending on use and care.

You should bring a waterproof jacket and strong boots in case of ___ weather. A: rainy B: stormy C: wet D: raining

___is required to be carried in lifeboat but not in life raft. A: waterproof electric torch B: hatchet C: adar reflecto D: ocket parachute flare

We have tested three hundred types of boots, ______ is completely waterproof. A: no of which B: none of which C: some of that D: neither of which

We've tested three hundred types of boots, ______ is completely waterproof. A: no of which B: none of which C: some of that D: neither of which

We have tested one hundred types of boots, ______ is completely waterproof. A: no of which B: some of what C: none of which D: neither of which