Firstly is the fielding of two new small-calibre grenade launchers specifically intended for airburst use the south korean 20 mm k11 and the us 25 mm xm25 .
A ton of water is about a cubic meter . 2.15 Billion cubic meters divided by the surface area of the oceans equals about 6 microns ( 0.006 mm ) .
一吨海水差不多是一立方米,那么21.5亿立方米除以海洋的表面积约为6微米(0.006毫米)。
Nacreous clouds are a type of wave cloud composed of very small ( approximately 0.0004 in or 0.01 mm in diameter ) , similar-sized ice crystals or ice particles .
Precipitation in yellowstone is highly variable and ranges from 15 inches ( 380 mm ) annually near mammoth hot springs , to 80 inches ( 2000 mm ) in the southwestern sections of the park .
He believes that , " individuals found to have differences in systolic blood pressure in between arms of greater than 10 or 15 mm hg should undergo further vascular assessment . "