<samp id="xsjkx"><th id="xsjkx"></th></samp>

<table id="xsjkx"><menuitem id="xsjkx"><ins id="xsjkx"></ins></menuitem></table>

網(wǎng)站首頁考試題庫熱門試題智能家居網(wǎng)課試題

水路交通運(yùn)輸技能考試

題庫首頁每日一練章節(jié)練習(xí)

航海英語天文航海單項(xiàng)選擇題每日一練(2019.02.20)

來源：考試資料網(wǎng)

1 A double star is a star that（）.

點(diǎn)擊查看答案

2 A sidereal day is shorter than a solar day. This difference is due to（）.

點(diǎn)擊查看答案

3 A star that suddenly becomes several magnitudes brighter and then gradually fades is a（）.

點(diǎn)擊查看答案

4 During one synodic rotation，a body makes one complete turn relative to the（）.

點(diǎn)擊查看答案

5 A phase correction is applied to observations of（）.

點(diǎn)擊查看答案

<table id="iifas"><legend id="iifas"><big id="iifas"></big></legend></table>

<progress id="iifas"><menuitem id="iifas"></menuitem></progress>

<table id="iifas"><legend id="iifas"><ins id="iifas"></ins></legend></table>